// editor1
#include <stdio.h>
#include <math.h>
int main(){
    double P,R,N;
    
    if (scanf("%lf %lf %lf", &P, &R, &N) != 3){
        printf("Invalid input");
        return 0;
        
    }
    if(N == 0){
        printf("Invalid input");
        return 0;
    }
    if(R == 0){
        double EMI =P / N;
        printf("%.2f",EMI);
        retur
    }
    
    double monthly_rate = (R/100.0)/12.0;
    double pow_val = pow(1 + monthly_rate, N);
    double EMI = P * monthly_rate * pow_val / (pow_val - 1);
    printf("%.2f", EMI);
    return 0;
}