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#include <bits/stdc++.h>
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using namespace std;
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int main() {
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int a, b;
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cin >> a >> b;
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for (int i = 1;; i++) {
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if (1.9 * i > (a + 0.1 * b)) {
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cout << i - 1 << endl;
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break;
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}
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}
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return 0;
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}
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