import sequtils,strutils,algorithm,math


var
    N = stdin.readline.parseInt
    a = 0
    i = 1
if N > 137438691328:
    echo("No")
else:
    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")