#include <iostream>
#include <stdio.h>
using namespace std;


void zd1a(){
    int a, b, c, d;
    cout << "Podaj 4 liczby rzeczywiste: ";
    cin >> a >> b >> c >> d;

    int ilosc_par = 0;
    if (a == b) ilosc_par++;
    if (a == c) ilosc_par++;
    if (a == d) ilosc_par++;
    if (b == c) ilosc_par++;
    if (b == d) ilosc_par++;
    if (c == d) ilosc_par++;

    switch (ilosc_par)
    {
    case 6: cout << "Czworka";
        break;
    case 3: cout << "Trojka";
        break;
    case 2: cout << "Dwojka";
        break;
    case 1: cout << "Jedna para";
        break;
    case 0: cout << "Brak powtorzen";
        break;
    default: cout << "Bledny algorytm";
        break;
    }
}
void zd1c(){
    double a, b, c, d;

    cin >> a >> b >> c >> d;

    double max = a;
    if (b > max) max = b;
    if (c > max) max = c;
    if (d > max) max = d;

    double max2 = 0;
    if (a > max2 && a != max) max2 = a;
    if (b > max2 && b != max) max2 = b;
    if (c > max2 && c != max) max2 = c;
    if (d > max2 && d != max) max2 = d;

    double s = (max + max2) / 2;
    cout << s;
}
void zd1e(){
    double a, b, c, d;
    int licznik = 0;

    cin >> a >> b >> c >> d;

    if (a < 0) licznik++;
    if (b < 0) licznik++;
    if (c < 0) licznik++;
    if (d < 0) licznik++;
}
void zd1g(){
    int a, b, c, d;

    cin >> a >> b >> c >> d;

    int ilosc_par = 0;
    if (a == b) ilosc_par++;
    if (a == c) ilosc_par++;
    if (a == d) ilosc_par++;
    if (b == c) ilosc_par++;
    if (b == d) ilosc_par++;
    if (c == d) ilosc_par++;

    cout << ilosc_par;
}
void zd1h(){
    char a, b, c, d;

    cin >> a >> b >> c >> d;

    if (a == 'b' || b == 'b' || c == 'b' || d == 'b')
        if (a == 'a' || b == 'a' || c == 'a' || d == 'a')
            if (a == 'j' || b == 'j' || c == 'j' || d == 'j')
                if (a == 't' || b == 't' || c == 't' || d == 't')
                    cout << "tak";
                else
                    cout << "nie";
            else
                cout << "nie";
        else
            cout << "nie";
    else
        cout << "nie";
}

void zd2a(){
    int n;
    cin >> n;
    int i = 1;

    while (n > 0){
        if (i % 7 == 0 && i % 2 == 1){
            cout << i << endl;
            n--;
        }
        i++;
    }
}
void zd2b(){
    int a, b;
    int licznik = 0;
    cin >> a >> b;

    if (b > a){
        for (int x = a; x <= b; x++){
            for (int y = a; y <= b; y++){
                if (x*x + y*y <= 50){
                    licznik++;
                }
            }
        }
    }
    cout << licznik;
}
void zd2c(){
    char znak;
    char znakPoprzedni;
    int podRzad = 1;
    int ileLiter = 0;
    int ileCyfr = 0;

    cin >> znakPoprzedni;

    while (podRzad < 3){
        cin >> znak;

        if (znak == znakPoprzedni)
            podRzad++;
        else
            podRzad = 1;

        if (znak >= 48 && znak <= 57)
            ileCyfr++;
        if (znak >= 65 && znak <= 90 || znak >= 97 && znak <= 122)
            ileLiter++;

        znakPoprzedni = znak;
    }

    if (ileCyfr > ileLiter)
        cout << "Jest wiecej cyfr" << endl;
    else
        cout << "Jest wiecej liter" << endl;
}

int zd3c(int tab[5]){
    int i = 0;
    int min;
    bool c = true;


    while (c){
        if (tab[i] > 0){
            min = tab[i];
            c = false;
        }
        i++;
        if (i >= 5)
            return -1;
    }

    for (i; i < 5; i++){
        cout << tab[i];
        if (tab[i] < min && tab[i] > 0){

            min = tab[i];

        }
    }
    return min;
}

void main()
{
    int tab[5];

    for (int i = 0; i < 5; i++)
    cin >> tab[i];

    cout << zd3c(tab);
    system("PAUSE");
}