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#include <bits/stdc++.h>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
int n,k;
int v[100003];
long long rez,val;
int main()
{
fin>>k>>n;
for (int i=1; i<=n; i++)
fin>>v[i];
while (true)
{
bool ok=true;
for (int i=n; i>=n-k+1 && ok==true; i--)
{
if (v[i]==0) ok=false;
v[i]--;
}
if (ok)
{
sort(v+1,v+n+1);
rez++;
}
else
{
break;
}
}
fout<<rez;
return 0;
}