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#include <algorithm>
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#include <cstdio>
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#include <cstring>
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using namespace std;
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int main()
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{
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int n, k;
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scanf("%d%d", &n, &k);
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int ans = 0;
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ans += (n * 2 + k - 1) / k;
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ans += (n * 5 + k - 1) / k;
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ans += (n * 8 + k - 1) / k;
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printf("%d", ans);
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return 0;
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} |
