#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
#include <string>
#include <algorithm>
#include <iomanip>
using namespace std;

bool kadomatsu(int a, int  b, int c) {
	if(a == b || b == c || c == a) return false;
	return a < b && c < b || a > b && c > b;
}

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	vector<int> D(7);
	for(int i = 0; i < 7; i++) {
		cin >> D[i];
	}
	sort(D.begin(), D.end());

	do {
		bool flag = true;
		for(int i = 0; i <= 4; i++) {
			if(!kadomatsu(D[i], D[i + 1], D[i + 2])) {
				flag = false;
				break;
			}
		}
		if(flag) {
			cout << "YES" << endl;
			return 0;
		}
	} while(next_permutation(D.begin(), D.end()));
	cout << "NO" << endl;
}