#include <bits/stdc++.h>
using namespace std;
int main(){
	int i[3];
	cin>>i[0]>>i[1]>>i[2];
	sort(i,i+3);
	cout<<(i[0]+i[1]>i[2]?"Yes":"No");
	return 0;
}

/**************************************************************
	Problem: 1045
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2076 kb
****************************************************************/