// editor5
#include<stdio.h>
#include<math.h>

int main() {
    float P, R, N;
    
    scanf("%f %f %f", &P, &R, &N);
    
    if (P <= 0 || R <= 0 || N = 0) {
        return 1;
    }
    float monthly_rate = (R / 100.0) / 12.0;
    float numerator = P * monthly_rate * pow(1 + monthly_rate, N);
    float denominator = pow(1 + monthly_rate, N) - 1;
    
    float EMI = numerator / denominator;
    
    printf("%.2f\n",EMI);
    
    return 0;
}