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- #include<iostream>
- #include<iomanip>
- #include<cmath>
- #include <algorithm>
- using namespace std;
- void Ahmed_Negm(){
- #ifndef ONLINE_JUDGE
- freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
- #endif
- }
- int main()
- {Ahmed_Negm();
- double n, k, kiwi, blue, straw, res;
- cin>>n>>k;
- kiwi = (n*2)/k;
- blue = (n*5)/k;
- straw = (n*8)/k;
- res = ceil(kiwi) + ceil(blue) + ceil(straw);
- cout<<res;
- return 0;
- }
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