#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>15||N<=0||N>15){
        printf("Invalid input");
        return 0;
    }
    float montlyRate=R/(12* 100);
    float emi=(P*monthlyRate*pow(1+monthlyRate,N)/(pow(1+monthlyRate,N)-1);
    
    

printf("%.2f",emi);
return 0;
}