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