题解

#不想讲 #没时间讲

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b>>c;
	if((a+b)>c and (a+c)>b and (c+b)>a)
	{
		cout<<"yes";
	}else{
		cout<<"no";
	}
	return 0;
}