CSES – Missing Coin Sum

#include<bits/stdc++.h>
#define int long long
#define pii pair<int,int>
#define f first
#define s second
#define fastio ios_base::sync_with_stdio(0);cin.tie(0)
using namespace std;
//declare
const int maxci = 1e9+5;
int n;
vector<int> v;
//
signed main(){
    fastio;
    cin>>n;
    for(int i=0;i<n;i++){
        int x; cin>>x;
        v.push_back(x);
    }
    sort(v.begin(),v.end());
    int sum = 0;
    for(int i=0;i<n;i++){
        if(v[i]-sum > 1) break;
        sum += v[i];
    }
    cout<<sum + 1<<"\n";
    return 0;
}