#include <stdio.h>
 #include <math.h>
 int main(){
     double p,r;
     int n;
     scanf("%lf %lf %d",&p,&r,&n);
     if(n==0){
         printf("Invalid input");
         return 0;
     }
     double monthlyRate=r/(12*100);
     double EMI=(p*monthlyRate*pow(1+monthlyRate,n))/(pow(1+monthlyRate,n);
     printf("%.2lf",EMI);
     return 0;
 }