Big Font numbers

Hello can anybody tell me how to add big font numbers to my project? I want that my boost value would be in big numbers…

#include <LiquidCrystal.h>
int mapsen = 0; // Set MAP sensor input on Analog port 0
float boost =0;            //boost in bar
int boost_raw=0;
int boost_raw_avg=0;       //Boost in raw 0 - 1024 analog read
float boost_max =0;        //MAx Boost in raw 0 - 1024 analog read
int mapval = 0; // Set raw map value to 0
const int buttonPin = 7; 
volatile float peakboost = 0; // Set peak memory to 0
//bar graph
#define lenght 19.0
double percent=100.0;
unsigned char b;
unsigned int peace;
//bar graph end
int buttonState = 0; 
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);


byte p1[8] = {
  0x10,
  0x10,
  0x10,
  0x10,
  0x10,
  0x10,
  0x10,
  0x10};
 
byte p2[8] = {
  0x18,
  0x18,
  0x18,
  0x18,
  0x18,
  0x18,
  0x18,
  0x18};
 
byte p3[8] = {
  0x1C,
  0x1C,
  0x1C,
  0x1C,
  0x1C,
  0x1C,
  0x1C,
  0x1C};
 
byte p4[8] = {
  0x1E,
  0x1E,
  0x1E,
  0x1E,
  0x1E,
  0x1E,
  0x1E,
  0x1E};
 
byte p5[8] = {
  0x1F,
  0x1F,
  0x1F,
  0x1F,
  0x1F,
  0x1F,
  0x1F,
  0x1F};
  
void setup()
 {
 
  lcd.createChar(0, p1);
  lcd.createChar(1, p2);
  lcd.createChar(2, p3);
  lcd.createChar(3, p4);
  lcd.createChar(4, p5);
 
pinMode(buttonPin, INPUT); 
lcd.begin(20, 4);
lcd.setCursor(5, 0);
lcd.print("OPEL ASTRA");
lcd.setCursor(5, 1);
lcd.print("Boost Meter");
delay (3000); // Display splash screen for 2 seconds
lcd.clear();
lcd.setCursor(6, 1);
lcd.print("WELCOME");
delay(2000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("BOOST:");
lcd.setCursor(13,0);
lcd.print("bar");
lcd.setCursor(0,2);
lcd.print("Peak:");
lcd.setCursor(11,2);
lcd.print("bar");
}

void loop()
{
  unsigned int value = analogRead(0);
 
//  percent = value/1024.0*100.0;
 
  lcd.setCursor(0,3); 
 
  double a=lenght/90*(value/10);
 
 // drawing black rectangles on LCD
 
  if (a>=1) {
 
    for (int i=1;i<a;i++) {
 
      lcd.write(4);
 
      b=i;
    }
     a=a-b;
 }
 peace=a*5;
 
// drawing charater's colums
 
  switch (peace) {
 
  case 0:
 
    break;
 
  case 1:
    lcd.write(0);
 
    break;
 
  case 2:
    lcd.write(1);
    break;
 
  case 3:
    lcd.write(2);
    break;
 
  case 4:
    lcd.write(3);
    break;
 
  }
 
//clearing line
  for (int i =0;i<(lenght-b);i++) {
 
    lcd.print(" ");
  }
 

  
  buttonState = digitalRead(buttonPin);
  if (buttonState == LOW)       

  peakboost = boost; //sets peakboost to current boost reading, resetting the peak memory

{
 //Reads the MAP sensor raw value on analog port 0
 boost_raw_avg = analogRead(0);                     //reads boost 3 Bar 0 Volt = -1,5 bar 5 volt + 3,5 bar
 boost_raw = (boost_raw_avg + boost_raw * 10) / 11; //filter
 boost_raw = constrain(boost_raw, 100, 1024);       // limits range of sensor values to between 0 - 3,5 bar the 307 is = atmosfaric pressure on this sensor
 boost = map(boost_raw, 100, 1024, 10, 255);         // map the 0 - 1024 input to 0 - 350 milibar  
 boost = boost/100;

if (boost > peakboost) // If current boost is higher than peak, store in peak memory
{
peakboost = boost ;  // Store current boost in peak memory
}
{
lcd.setCursor(6,2);
lcd.print(peakboost,2);

lcd.setCursor(7,0);
lcd.print(boost,2);
delay(100);
 // prevents LCD display from ghosting. Lower number refreshes faster, higher number has less ghosting on slow LCD’s
}
}
}