vr 68

int a[100][100], p=1, m, n, i, j, uc;
    cout<<"n="; cin>>n;
    cout<<"m="; cin>>m;
    for(i=1; i<=n; i++)
        for(j=1; j<=m; j++)
            cin>>a[i][j];
    for(i=1; i<=n; i++)
    {
        for(j=1; j<=m; j++)
        {
            if(a[i][j]!=0 && i%2==0 && j%2!=0)
                p=p*a[i][j];
        }
    }
    uc=p%10;
    if(p==1)
        cout<<"NU EXISTA";
    else
        cout<<uc;