PROG-1070:triangle

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    scanf("%d",&n);
    int ar[n];
    for(int i=0;i<n;i++ ) scanf("%d",&ar[i]);
    if(n<3) {
        printf("no");
        return 0;
    }
    sort(ar,ar+n);
    if(ar[0]+ar[1]<=ar[n-1]) printf("yes");
    else printf("no");

    return 0;
}