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#include <fstream>
#include <algorithm>
using namespace std;
bool compar(int a,int b){
if(a<b)
return false;
else
return true;
}
int v[100001];
int main()
{
ifstream cin("grupuri.in");
ofstream cout("grupuri.out");
int k,n,i,da=1,nrg=0;
cin>>k>>n;
for(i=1;i<=n;i++){
cin>>v[i];
}
sort(v+1,v+n+1,compar);
while(da!=0){
for(i=1;i<=k;i++){
if(v[i]>0)
v[i]--;
else{
da=0;
break;
}
}
nrg++;
sort(v+1,v+n+1,compar);
}
cout<<nrg-1;
return 0;
}