noics50inp2.cpp

#include <bits/stdc++.h>
using namespace std;

int main()
{
	int n, m;

	while(cin >> n >> m)
	{
		if(!n and !m) break;

		int v[10010];
		memset(v, 0, sizeof(v));

		for(int i = 1; i <= m; i++)
		{
			int bilhete;
			cin >> bilhete;
			v[bilhete]++;
		}

		int cont = 0;

		for(int i = 1; i <= n; i++)
		{
			if(v[i] > 1) cont++;
		}

		cout << cont << "\n";
	}
}