import sequtils,strutils,algorithm,math


var
    N = stdin.readline.parseInt
    a = 0
    i = 1
while i * i <= N:
    if N mod i == 0:
        a += i
        if i * i != N:
            a += N div i
    i += 1

if a == 2 * N:
    echo("Yes")
else:
    echo("No")