#include <iostream>
using namespace std;

#define MAX_NUM 21

int main(){

    int n, suma = 0;

    do {

        cout << "Enter a number: ";
        cin >> n;

        if( n > 5 or n < 1){

            cout << "Number invalid." << endl;

        } else {

            suma += n;
            cout << "Number valid. Current result is " << suma << "." << endl;

        }

        cout << endl;

    } while( suma < MAX_NUM );


    cout << "Count surpased " << MAX_NUM << ", the final result is " << suma << "." << endl;
}