DTIEN C++

#include <bits/stdc++.h>
using namespace std;
int n;

int main()
{
    freopen("DTIEN.inp","r", stdin);
    freopen("dtien.out","w", stdout);
    //scanf("%d", &n);
    cin>>n;
    while (n>=10)
        n=n/10;
    cout<<n;
    //printf("%d", n);
}