#include <stdio.h>

int main(void)
{
	int card[50],pull_out,save;
	int i,j,N,M;
	scanf("%d %d",&N,&M);
	
	for(i=0; i<N; i++){
		card[i] = i+1;
	}
	
	for(i=0; i<M; i++){
		scanf("%d",&pull_out);
		save = card[pull_out -1];

		for(j=pull_out - 1; j > 0; j--){
				card[j] = card[j-1];
		}
		card[0] = save;
	}
	printf("%d",card[0]);
	return 0;
}