#include <stdio.h>
#include <stdlib.h>

int main(){
    double P, R_annual, N;
    scanf("%lf %lf %lf", &P, &R_annual, &N);
    if (N == 0){
        printf("Invalid input\n");
        
    }else {
        double R_monthly = (R_annual / 100) / 12;
        double X = pow(1 + R_monthly, N);
        double EMI = P * R_monthly * X / (X - 1);
        printf("%.2f\n", EMI);
    }
    return 0;
}