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#include <bits/stdc++.h>
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using namespace std;
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//难度低
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int main() {
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int m, n, k, p;
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cin >> m >> n >> k >> p;
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int count = 0;
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for (int i = 1; i <= p; i++) {
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if (i % m == 0 || i % n == 0 || i % k == 0) count++;
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}
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cout << count << endl;
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return 0;
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}
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