#include <bits/stdc++.h>

using namespace std;

long sumOfGroup(int k) {
    int p=0;
    int q=0;
    for(int n=1;n<26;n++)
    {
        q=0;
        for(int h=1;h<=20;h++)
             {
        if(n%2!=0)
        {
             
            for(int j=1;j<=h;j++)
            {
                 q=q+n;
                 if(h==k)
                 {   
                        p=p+q;    
                 }
                        n=n+2;
            }
             }
        }
        n=n+2; 
    }
    p=p-50;
    return p;
    // Return the sum of the elements of the k'th group.
}
int main() {
    int k;
    cin >> k;
    long answer = sumOfGroup(k);
    cout << answer << endl;
    return 0;
}