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

int main() { long long a,b,c,d; cin>>a; b=a/100; c=a%100/10; d=a%100%10; if(bbb+ccc+ddd==a){ cout<<"YES"; } else{ cout<<"NO"; } return 0; }

#include using namespace std;

int main() { int n; cin >> n; int a = n/100, b = n/10%10, c = n%10; cout << (aaa + bbb + ccc == n ? "YES" : "NO"); return 0; }

数学老师没教过>:(