Problem 20

#include<bits/stdc++.h>

#define Vi vector<int>
#define Vs vector<string>
#define Mii map<int,int>
#define Msi map<string,int>
#define Mis map<int,string>
#define Mss map<string,string>
#define T true
#define F false

typedef long long ll;
using namespace std;
int main(){
    int n,now,ans=1;
    int score[1000];
    cin>>n;
    for(int i=0;i<n;i++) cin>>score[i];
    sort(score,score+n);
    now=score[0];
    for(int i=0;i<n-1;i++){
        if(now!=score[i+1]) {
            now=score[i+1];
            ans++;

        }
    }
    if(score[0]==0) ans--;
    cout<<ans;
}