#include<stdio.h>
#include<math.h>
int main(){
    int p,r,n;
    scanf("%d %d %d",&p,&r,&n);
    
    
    }
    r=r/(12*100);
    
    float EMI =(p*r*pow(1+r,n));
    printf("%.2f",EMI); 
    return 0;
}