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#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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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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{
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int x, n, ans = 0;
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cin >> x >> n;
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for (int i = 0; i < n; i++, x++)
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if (x % 7 != 0 && x % 7 != 6)
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ans += 250;
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cout << ans;
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return 0;
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}
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