def main():
    inp1 = int(input())

    count = 0
    sec = 1
    sums = 0
    loop_flg = True
    while loop_flg:
        if inp1 == sums:
            print("YES")
            print(count)
            break
        elif inp1 < sums:
            print("NO")
            break
        else:
            pass
        sums = sums + sec
        sec += 1
        count += 1


if __name__ == '__main__':
    main()