#include <bits/stdc++.h>
using namespace std;
int main() {
  int a[7];
  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";
      return 0;
    }
  } while (next_permutation(a, a + 6));
  cout << "NO";
}
