import math

def main():
    a = int(input())
    b = int(input())
    c = int(input())

    normal_count = math.ceil(a/b)
    special_count = math.ceil(a/c)

    #print("normal_count", normal_count)
    #print("special_count", special_count)
    #print("2/3", normal_count * (2/3))

    if special_count <= normal_count * (2/3):
        print("YES")
    else:
        print("NO")

if __name__ == '__main__':
    main()