提出 #73687759

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ソースコード 拡げる

# ================= FAST IO =================
import sys
input = sys.stdin.readline

# ================= INPUT HELPERS =================
def Int():
    return int(input())

def Ints():
    return list(map(int, input().split()))

def Str():
    return input().strip()

def Strs():
    return input().split()

# ================= CONSTANTS =================
INF = int(1e18)
MOD = 10**9 + 7



# ================= DRIVER =================
def main():
    a, b = Ints()
    if a >= 2 * b - 1:
      print("Yes")
    else:
      print("No")

# ================= ENTRY =================
if __name__ == "__main__":
    main()

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