#include<stdio.h>
#include<math.h>
int main(){
    double P, R, EMI;
    int N;
    scanf("%lf %lf %d", &P, &R, &N);
    if (N == 0){
        printf(" invalid Input\n");
        return 0;
    }
    double r = (R / 100.0) / 12.0;
    double numerator = P * r * pow( 1= r, N);
    double denominator = pow(1 + r, N) - 1;
    EMI = numerator / denominator;
    printf(" %.2lf\n", EMI);
    return 0; 
}