https://cses.fi/paste/6b9842c9b46ce28d778f8d/
import sys input = sys.stdin.readline output = sys.stdout.write # must be string n = int(input()) arr = sorted(int(x) for x in input().split()) s = {1} ok = 0 for i in range(0,n): if arr[i] == 1: ok = 1 s.add(arr[i]) ans = len(s) if (ok == 0): ans = ans - 1 output(f"{ans}")