#include <stdio.h>
#include <math.h>

int main(){
    float P, R;
    int N;
    
    scanf("%f %f %d", &P, &R, &N);
    
    if(P<=0||P>1000000||R<=0||R>15||N<=0||N>15){
        printf("Invalid input");
        return 0;
    }
    
    float monthlyRate=R/(12*100);
    
    float emi=(P* monthlyRate*pow(1+ monthlyRate, N))/(pow(1 + monthlyRate, N))- 1);
    
    printf("%.2f", emi);
    return 0;
}