PARE2:

#include <iostream>
#include <vector>
#include <cmath>
using namespace std;

int main(){
    int n;
    bool trobat, parell, senar;
    while(cin >> n){
        trobat = parell = senar = false;
        vector <int> v(n);
        for(int i = 0; i < n; ++i) cin >> v[i];
        for(int i = 0; i < n and not trobat; ++i){
            if(v [i] % 2 == 0) parell = true;
            else senar = true;
            if(parell and senar) trobat = true;
        }
        if(trobat) cout << "si" << endl;
        else cout << "no" << endl;
    }
}