#include <bits/extc++.h>

int main() {
    using namespace std;
    vector<unsigned long> A(6), V(6);
    for(unsigned long i{}; i < 6; ++i){
        cin >> A[i];
        [&]{
            for(unsigned long j{}; j < i; ++j)if(A[j] == A[i])return V[i] = V[j];
            V[i] = *max_element(begin(V), begin(V) + i) + 1;
        }();
    }
    for(auto&& a : V)--a;
    for(unsigned long i{}; i < 64; ++i){
        transform(begin(V), end(V), begin(A), [&i](auto x){return 1UL & (i >> x);});
        if((!(A[0] && A[1]) && A[2]) || (!(A[3] && A[4]) && A[5])){
            cout << "YES" << endl;
            return 0;
        }
    }
    cout << "NO" << endl;
    return 0;
}