#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h> 

#define THRESH 2000

int main(){
    int i;
    int remtime;
    int prpnum;
    int buffer[THRESH];
    scanf(" %d", &remtime);
    scanf(" %d", &prpnum);

//    printf("time: %d, prpnum: %d\n", time, prpnum);
    int data[prpnum];
    for(i=0; i < prpnum; i++)
    {
        scanf(" %d", &data[i]);
    }

    int timesum = 0;
    for(i=0; i< prpnum; i++)
    {
        timesum += data[i];
    }

    double answer = ceil((double)timesum/(double)remtime);
    printf("%d\n", (int)answer);
}