구름 문제 근묵자흑

 

 

#include <vector>
#include <iostream>
using namespace std;

int main() {
	int n;
	int k;
	int idx;
	int answer = 0;

	cin >> n;
	cin >> k;
	vector<int> v(n);

	for(int i = 0; i < v.size(); i++)
	{
		cin >> v[i];
	}
	idx = 0;
	while (idx < n)
	{
		if (idx == 0)
			idx = idx + k;
		else 
			idx = idx + k - 1;
		answer++;
	}
	cout << answer;
	return 0;
}