#include <bits/stdc++.h>
using namespace std;

#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define FOR(i, a, b) for (int i = (a); i<(b); ++i)
#define RFOR(i, b, a) for (int i = (b)-1; i>=(a); --i)
#define MP make_pair
#define PB push_back
#define F first
#define S second

typedef long long LL;
typedef pair<int, int> PII;
typedef vector<int> VI;

const int D = 22;
const int N = 2047;

int a[N];
int dp[N][D];

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, d;
	cin >> n >> d;
	FOR(i, 0, n) {
		cin >> a[i];
	}
	FOR(i, 0, n + 1) {
		FOR(j, 0, d + 2) {
			dp[i][j] = 1e9;
		}
	}
	dp[0][0] = 0;
	FOR(i, 0, n + 1) {
		int s = 0;
		FOR(j, i, n + 1) {
			int r = s % 10, f = s + (r < 5 ? -r : 10 - r);
			FOR(k, 0, d + 1) {
				dp[j][k + 1] = min(dp[j][k + 1], dp[i][k] + f);
			}
			s += a[j];
		}
	}
	cout << dp[n][d + 1] << "\n";
	return 0;
}