#include <stdio.h>
#include <stdlib.h>

double mx(double a, double b)
{
    if (a > b)
        return a;
    return b;
}

double mn(double a, double b)
{
    if (a < b)
        return a;
    return b;
}

int main(void)
{
    double a, b, c, d;
    scanf("%lf%lf%lf%lf", &a, &b, &c, &d);

    double OX, OY;
    OX = (double)(b) / 2;
    OY = (double)(a) / 2;

    double d2 = c * c + d * d;
    double r2 = d2 / 4;


    //Finding cross b
    double D1 = -4 * (a * a - 2 * a * OY + OY * OY - r2);

    double sqrtD1;
    for (int i = 0; i * i <= D1; ++i)
        sqrtD1 = i;

    double xb1 = (2 * OX + sqrtD1) / 2;
    double xb2 = (2 * OX - sqrtD1) / 2;

    //finding cross a
    double D2 = -4 * (OX * OX - r2);

    double sqrtD2;
    for (int i = 0; i * i <= D2 * D2; ++i)
        sqrtD2 = i;

    double xa1 = (2 * OY + sqrtD2) / 2;
    double xa2 = (2 * OY - sqrtD2) / 2;

    if (D1 <= 0 && D2 <= 0)
        printf("YES");
    else
        if (D1 > 0 && D2 > 0)
        {
            double cbm = mn(xb1, xb2);
            if (cbm < 0 || cbm > b)
                cbm = mx(xb1, xb2);

            if (cbm < 0 || cbm > b)
                printf("NO");
            else
            {
                double cam = mn(xa1, xa2);
                if (cam < 0 || cam > a)
                    cam = mx(xa1, xa2);

                if (cam < 0 || cam > a)
                    printf("NO");
                else
                    if (cam * cam + cbm * cbm >= c)
                        printf("YES");
                    else
                        printf("NO");
            }
        }
        else
            if (D1 > 0 && (0 <= xb1 && xb1 <= b) && (0 <= xb2 && xb2 <= b) && (mx(xb1, xb2) - mn(xb1, xb2) >= d))
                printf("YES");
            else
                if (D2 > 0 && (0 <= xa1 && xa1 <= a) && (0 <= xa2 && xa2 <= a) && (mx(xa1, xa2) - mn(xa1, xa2) >= c))
                    printf("YES");
                else
                    printf("NO");


    return 0;
}