include

include

using namespace std;

int main(){

int a,b,c;

cin>>a>>b>>c;
if(a<b)swap(a,b);
if(a<c)swap(a,c);
if(a>b+c)cout<<"not a triangle"<<endl;
else if(a*a==b*b+c*c)cout<<"yes"<<endl;
else cout<<"no"<<endl;

return 0;

}