#include <bits/stdc++.h>
using namespace std;
int a[6];
int main() {
  for (int i = 0; i < 6; i++) {
    cin >> a[i];
  }
  sort(a, a + 6);
  do {
    if (a[0] + a[1] + a[2] == a[3] + a[4] + a[5]) {
      cout << "YES" << endl;
      return 0;
    }
  } while (next_permutation(a, a + 6));
  cout << "NO" << endl;
}
