https://www.acmicpc.net/problem/2839
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#include <iostream>
using namespace std;
int main()
{
int result;
int N;
cin >> N;
if (N == 4 || N == 7)
{
result = -1;
cout << result;
}
else if (N % 5 == 2 || N % 5 == 4)
{
result = N / 5 + 2;
cout << result;
}
else if (N % 5 == 1 || N % 5 == 3)
{
result = N / 5 + 1;
cout << result;
}
else
{
result = N / 5;
cout << result;
}
}
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cs |