#include <iostream>
using namespace std;

int sort(int ncol, int nlines, int a[])
{

    for (int i = 0; i < 3; i++)
    {
        for (int j = 0; j < 3; j++)
        {
            if (a[i * ncol + j] < a[ncol * 0])
            {
                a[ncol * 0] = a[i *ncol + j];
            }
        }
    }

    return a[ncol * 0];

}

int main()
{
    int n[3][3];
    int num = 0;
    int n1;

    for (int j = 0; j < 3; j++)
    {
        for (int i = 0; i < 3; i++)
        {
            cin >> n1;
            n[j][i] = { n1 };
        }
    }


    num = sort(3,3, &n[0][0]);

    cout << num;

    return 0;
}