#include #include using namespace std;

int main() { while (true) { int N, M; if (!(cin >> N >> M)) { break; } vector nums; for (int i = 0; i < M; i++) { int num; cin >> num; nums.push_back(num); } int count = 0; for (int i = 1; i < N; i++) { for (int num : nums) { if (i % num == 0) { count++; break; } } } cout << count << endl; } return 0; }


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