#!/usr/bin/env python3
# †
from math import isqrt

###
if __name__ == '__main__':
    n = int(input())
    r = (isqrt(8*n+1) - 1) // 2
    if r * (r+1) // 2 == n:
        print('YES')
        print(r)
    else:
        print('NO')