#include<iostream> 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; }

#include<iostream> using namespace std; int main(){ int a; cin>>a; if(a+b>c&&a+c>b&&c+b>a) cout<<"yes"; else cout<<"no"; }