#include<stdio.h>
#include<math.h>
int main(){
    float p,r,n;
    scanf("%f %f %f",&p,&r,&n);
    if(n==0){
        printf("Invalid input");
    }else{
        float r=(r/100)/12;
        float numerator=p*r*pow(1+r,n);
        float denominator=pow(1+r,n)-1;
        float emi=numeraor/denominator;
        float round_emi=(int)(emi*100+0.5)/100.0;
        printf("%.2f\n",round_emi);
}
return 0;
}