UVA 10499

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    int n;
    double s;
    while(cin>>n)
    {
        if(n<0)break;
        if(n<=1)s=0;
        else s=n;
        s=s*25.0;
        printf("%.lf%%\n",s);
    }
    return 0;
}