#include<stdio.h>
#include<stdlib.h>
int main(){
    double p,r;
    int n;
    scanf("%lf %lf %d",&p,&r,&n);
    if(n==0){
        printf("Ivalid input");
        return 0;
    }
    double R=r/(12*100);
    double nr=p * R * pow(1+R,n);
    double dr=pow(1+R,n)-1;
    double emi=nr/dr;
    printf("%.2f",emi);
    return 0;
}