main
黄海 1 year ago
parent 94518ff5a5
commit f7b18e620d

@ -0,0 +1,24 @@
#include <iostream>
using namespace std;
int n, cnt;
int main() {
cin >> n;
if (n == 2)
cnt = -1;
else if (n == 4)
cnt = 4;
else if (n == 5)
cnt = 3;
else if (n == 7)
cnt = 3;
else if (n % 3 == 0)
cnt = n / 3;
else if (n % 3 == 1)
cnt = (n - 7) / 3 + 3;
else if (n % 3 == 2)
cnt = (n - 5) / 3 + 3;
cout << cnt << endl;
return 0;
}

@ -0,0 +1 @@
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