简单易懂

#include <iostream>
using namespace std;
int main()
{
    int a,b,c;
    cin >> a >> b >> c;
   	if(a+b > c and a+c > b and b+c > a)
    {
        cout << "yes";
    }
    else
    {
        cout << "no";
    }
    return 0;
}