#include<stdio.h>
#define N 100001
#define lul unsigned long long
lul a[N],n,m,i,j,r,s,t;
int main()
{freopen("grupuri.in","r",stdin);
freopen("grupuri.out","w",stdout);
scanf("%llu%llu",&n,&m),r=n;
for(i=1;i<=m;i++)
       scanf("%llu",&a[i]),s+=a[i];
t=s/r,j=m;
while(t<a[j])
       {for(i=j;i&&a[i]>t;i--)
             s-=a[i];      
       j=m-i,r-=j;
       if(s<r)
             break;
       t=s/r;}
printf("%llu",t);
return 0;}