#include<bits/stdc++.h>
using namespace std;

int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b>c&&c+b>a&&a+c>b) cout<<"yes";
	else cout<<"no";
	return 0;
}

#include<bits/stdc++.h>
using namespace std;

int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b>c&&c+b>a&&a+c>b) cout<<"yes";
	else cout<<"no";
	return 0;
}

#include<bits/stdc++.h> using namespace std;

int main() { ** int a,b,c;** ** cin>>a>>b>>c;** ** if(a+b>c && b+c>a && c+a>b){** ** if(a*a+b*bc || a*a+c*cb*b || b*b+c*c==a*a)** cout<<"yes"; ** if(a*a+b*b<c*c || a*a+c*c<b*b || b*b+c*c<a*a)** cout<<"yes"; ** if(a*a+b*b>c*c && a*a+c*c>b*b && b*b+c*c>a*a)** cout<<"yes"; ** }else cout<<"no"; ** return 0; }