#include<stdio.h>
int k,n,nr;
int main ()
{
    int ck,i,val;
    freopen("grupuri.in","r",stdin);
    freopen("grupuri.out","w",stdout);
    scanf("%d%d",&k,&n);
    ck=k;
    for(i=1;i<=n;i++)
    {
        scanf("%d",&val);
        if(val>k)
        {
            nr++;
            continue;
        }
        ck-=val;
        if(ck<1)
        {
            ck+=k;
            nr++;
        }
    }
    printf("%d\n",nr);
    return 0;
}