#include #include #include using namespace std; int main(){ int n;cin>>n; vector score(n); for(int i=0;i>score[i]; vector man(101); fill(man.begin(),man.end(),0); for(int i=0;i>b; man[b]+=score[i]; } if(max_element(man.begin(),man.end()) == man.begin()) cout<<"YES"<