//goo.gl/zKzUMZ
int min(int a, int b) {
    if (a > b) {
        return b;
    }
    else return a;
}

int min4(int a, int b, int c, int d) {
    if ((min(a, b)) > c || (min(a, b)) > d) {
        if (c > d) {
            return d;
        }
        else return c;
    }
    else return (min(a, b));
}


int main()
{
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    cout << min4(a, b, c, d);
    return 0;
}

//goo.gl/nst98y
double distance(double x1, double y1, double x2, double y2) {
    return sqrt((pow((x2 - x1), 2)) + (pow((y2 - y1), 2)));
}

int main()
{
    double x1, y1, x2, y2;
    cin >> x1 >> y1 >> x2 >> y2;
    cout << distance(x1, y1, x2, y2);
    return 0;
}

//goo.gl/vhZP8V
bool IsPointInSquare(double x, double y) {
    return ((abs(x)<= 1) && (abs(y)<= 1));
}

int main()
{
    double x, y;
    cin >> x >> y;
    if (IsPointInSquare(x, y)) {
        cout << "YES";
    }
    else cout << "NO";
    return 0;
}

//goo.gl/Db8iHD
bool IsPointInSquare(double x, double y) {
    return ((abs(x)<= 1) && (abs(y)<= 1) && (abs(x) + abs(y)<= 1));
}

int main()
{
    double x, y;
    cin >> x >> y;
    if (IsPointInSquare(x, y)) {
        cout << "YES";
    }
    else cout << "NO";
    return 0;
}

//goo.gl/y4ar5q
bool IsPointInCircle(double x, double y, double xc, double yc, double r) {
    return (pow(x - xc, 2) + pow(y - yc, 2) <= pow(r, 2));
}

int main()
{
    double x, y, xc, yc, r;
    cin >> x >> y >> xc >> yc >> r;
    if (IsPointInCircle(x, y, xc, yc, r)) {
        cout << "YES";
    }
    else cout << "NO";
    return 0;
}