#include<stdio.h>

int main(void){
	int n,m,i,j,c[64],k,s;
	scanf("%d%d",&n,&m);
	for(i = 1;i <= n;i++){
		c[i]=i;
	}
	for(i = 1;i <= m;i++){
		scanf("%d",&k);
		if(k == 1){continue;}
		s = c[k];
		for(j = k;j >= 2;j--){
			c[j] = c[j-1];
		}
		c[1] = s;
	}
	printf("%d\n",c[1]);
	return 0;
}