TONGCS C++

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

int n,s,x;
int main ()
{
   // freopen("tongcs.inp","r",stdin);
    ///freopen("tongcs.out","w",stdout);
    cin>>n;
    s=0;
    while(n>0)
    {
        x = n%10;
        s=s+x;
        n=n/10;
    }
    cout<<s;
}