答案

#include<cstdio>

 #include<cstring>

 #include<cmath>

 #include<iostream>

 using namespace std;

 int main(){

 int a,b,c;

 cin>>a>>b>>c;

 if(a+b>c) { 

cout<<"Yes"; 

}else{

 cout<<"No";

 } 

return 0;

 }