#include <iostream>
#include <math.h>
using namespace std;
int main()
{
 //int a,b,c;
    //cin>>a>>b>>c;
 
    float p,r,n;

   try
    {   
       cin>>p>>r>>n;
       if(cin)
        {
     float amt = p * pow((1+(r/100)),n);
        cout<<"Compound Interest is:"<<amt-p;
        }
       
       else
        {
   throw p;
        }
    }
   catch(float n)
    {
       cout<<"Invalid input. Try again";
    }
 return 0;
}