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#include <iostream>
using namespace std;
int gcd(int x, int y)
{
while (x != y)
if (x > y)
x -= y;
else
y -= x;
return x;
}
int main()
{
int a, b, c, d;
cout << "a, b, c, d= ";
cin >> a >> b >> c >> d;
if (!cin || a < 1 || b < 1 || c < 1 || d < 1)
{
cout << "Error! \n";
return 1;
}
int r = gcd(a, b);
cout << "gcd{" << a << ", " << b << "}= " << r << "\n";
int s = gcd(c, d);
cout << "gcd{" << c << ", " << d << "}= " << s << "\n";
cout << "gcd{" << a << ", " << b << ", " << c << ", " << d << "}= " << gcd(r, s) << "\n";
return 0;
}
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