1 #include<cstdio>
 2 #include<cstring>
 3 #include<iostream>
 4 #include<algorithm>
 5 #define INF 1e8
 6 using namespace std;
 7 
 8 int n,L;
 9 int a[50],dp[50][50];
10 
11 void solve()
12 {   for(int i=0;i<=n;i++) dp[i][i+1]=0;
13     for(int len=2;len<=n+1;len++){
14         for(int i=0;i+len<=n+1;i++){
15             int j=len+i;
16             for(int k=i+1;k<j;k++) dp[i][j]=min(dp[i][j],dp[i][k]+dp[k][j]);
17             dp[i][j]+=a[j]-a[i];
18         } 
19     }
20     
21     printf("The minimum cutting is %d.\n",dp[0][n+1]);
22 }
23 
24 int main()
25 {    while(cin>>L&&L){
26         cin>>n;
27         for(int i=1;i<=n;i++) cin>>a[i];
28         a[0]=0,a[n+1]=L;
29         memset(dp,0x3f,sizeof(dp));
30         solve();
31     }
32     return 0;
33 }