#include <bits/stdc++.h>
using namespace std;

int main()
{
    int n, m; cin>>n>>m;
    vector<int> a(n);
    for(auto& e: a) cin>>e;

    vector<vector<int>> g(n);
    while (m--) {
        int u, v; cin>>u>>v;
        --u, --v;
        g[u].push_back(v);
        g[v].push_back(u);
    }

    auto is_kadomatsu=[&](int i, int j, int k)
    {
        return (a[i]<a[j] and a[j]>a[k] or a[i]>a[j] and a[j]<a[k]) and a[i]!=a[k];
    };

    function<bool(int, int, int, int)> dfs=[&](int i, int j, int k, int d)
    {
        if (d>3) return false;
        if (k>=0 && is_kadomatsu(i, j, k)) return true;
        for(int v: g[i])
            if (v!=j and dfs(v, i, j, d+1)) return true;
        return false;
    };

    for(int i=0; i<n; ++i) {
        if (dfs(i, -1, -1, 0))
            return cout<<"YES"<<endl, 0;
    }
    cout<<"NO"<<endl;
}