Fluctuating temperature using NTC

Other Hardware Sensors
3

This is the code:

float Vin = 5.0;
float Rfija = 4630.0;
float R25 = 10000.0;
float Beta = 3495.0;
float T0 = 298.15;

float Vout = 0.0;
float Rntc = 0.0;
float TempK = 0.0;
float TempC = 0.0;

(...)

Vout=(Vin/1024)(analogRead(A0));
Rntc=(VoutRfija)/(Vin-Vout);
TempK = Beta/(log(Rntc/R25)+(Beta/T0));
TempC = TempK-273.15;

Rfija - the constant resistor from the divider
The thermistor is connected to the ground (to avoid, as more as I can, high current through thermistor) into divider of tension.

Thank you!