import sys


def main():
    input = lambda: sys.stdin.readline()[:-1]
    I, J, K = map(int, input().split())

    if min((I, J, K)) == I:
        print("Yes")
    else:
        print("No")


if not __debug__:
    f = open(sys.argv[1], "r")
    sys.stdin = f

main()