Example

#include <iostream>

using namespace std;

int main(){
    const int N = 10;

    int count[1001];
    for (int i = 0; i <= 1000; i++)
        count[i] = 0;

    for (int i = 0; i < N; i++){
        int x;
        cin >> x;
        count[x]++;
    }
    int max = 0, index = 0;
    for (int i = 0; i <= 1000; i++)
        if (count[i] > 0 && count[i] > max){
            max = count[i];
            index = i;
        }

    cout << index;

    return 0;
}