#include <iostream>
using namespace std;
int main() {
int a;
int b;
int c;
while(cin >> a >> b >> c)
{
if( a+b>c and b+c>a and a+c>b )
{
cout << "Yes" << endl;
}
else
{
cout << "No" << endl;
}
}
return 0;
}
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