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34 lines
749 B
34 lines
749 B
#include <bits/stdc++.h>
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using namespace std;
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const int INF = 0x3f3f3f3f;
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typedef long long LL;
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const int N = 20;
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int a[N];
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int n, m;
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int res;
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int main() {
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scanf("%d %d", &n, &m);
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for (int i = 0; i < m; i++) scanf("%d", &a[i]);
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for (int i = 1; i < 1 << m; i++) {
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int s = 1, c = 0;
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for (int j = 0; j < m; j++)
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if (i >> j & 1) {
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if ((LL)s * a[j] > n) {
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s = 0;
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break;
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}
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s *= a[j];
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c++;
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}
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if (s) {
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if (c & 1)
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res += n / s;
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else
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res -= n / s;
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}
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}
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printf("%d\n", res);
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return 0;
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} |