Triangle

#include<stdio.h>
#include<algorithm>
using namespace std;

int main()
{
    int n;
    scanf("%d",&n);

    int arr[n];
    for(int i = 0 ; i < n ; i ++){
        scanf("%d",&arr[i]);
    }
    if(n < 3){
        printf("no");
        return 0;
    }
    sort(arr,arr+n);
    printf("%s",(arr[0] + arr[1] > arr[n-1] ? "no" : "yes"));
    return 0;
}