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

/**************************************************************
	Problem: 1045
	User: ljl2
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/