#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";
    }
}
/**************************************************************
	Problem: 1045
	User: baizhoudeyueguang
	Language: C
	Result: Compile Error
****************************************************************/