#!/usr/bin/env python3
def getArithmeticSequenceSum(a0: int, l: int, n: int):
    return (a0 + l) * n // 2

def main():
    N, M = map(int, input().split())
    l = getArithmeticSequenceSum(1, N, N)
    print("Yes" if M >= l else "No")
    return

if __name__ == '__main__':
    main()