def main():
    list = [int(x) for x in input().split()]


    if (list[0] > list[1] + list[2]):
        print("No")
        return
    elif(list[1] > list[2] + list[0]):
        print("No")
        return
    elif(list[2] > list[0] + list[1]):
        print("No")
        return
    else:
        print("Yes")

if __name__ == "__main__":
    main()
