#include <stdio.h>
#include <math.h>
int main(){
    float P,R;
    int N;
    scanf("%f %f %f",&P,&R,&N);
    if(P<=0,P>1000000 || R<0 || R<=0 ||N<=0||N>15){
        printf("Invalid input\n");
        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;
}