#include<bits/stdc++.h>
#define ALL(v) std::begin(v),std::end(v)
using lint=long long;
using lubl=long double;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint n=7;
    std::vector<lint>a(n);
    for(lint&x:a)std::cin>>x;
    std::sort(ALL(a));
    do{
        for(lint i=0;i<=6;i+=2){
            if(i==6){
                std::cout<<"YES"<<'\n';
                return 0;
            }
            if((a.at(i)-a.at(i+1))*(a.at(i+2)-a.at(i+1))<=0||i<5&&a.at(i)>=a.at(i+2))break;
        }
    }while(std::next_permutation(ALL(a)));
    std::cout<<"NO"<<'\n';
}