#include<stdio.h>

int main()
{
  int card[51],n,m,a,i,j,draw;

  scanf("%d %d",&n,&m);

  for (i=1;i<=n;i++) {
    card[i]=i;
  }

  for (i=0;i<m;i++) {
    scanf("%d",&a);
    draw=card[a];
    for (j=a;j>1;j--) {
      card[j]=card[j-1];
    }
    card[1]=draw;
  }

  printf("%d\n",card[1]);
  return 0;
}