请帮忙看一下为什么会0分，都是RE

#include <bits/stdc++.h>
using namespace std;
int dp[100001];
const int INF = 0x3f3f3f3f;
int main()
{
	int n, cost;
	cin >> n;
	dp[0] = 0;
	for (int i = 1; i <= n; i++){
	    cost = INF;
		if (i - 1 >= 0)
			cost = min(cost, dp[i - 1] + 1);
		if (i - 5 >= 0)
			cost = min(cost, dp[i - 5] + 1);
		if (i - 11 >= 0)
			cost = min(cost, dp[i - 11] + 1);
		dp[i] = cost;
	}
	cout << dp[n];
	
	return 0;
}