#include <bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b>c&&a+c>b&&b+c>a)cout<<"Yes";
	else cout<<"No";
	return 0;
}
/**************************************************************
	Problem: 1045
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/