#include <stdio.h>

int main(){
	int num = 0;
	scanf("%d",&num);
	int card[num];
	int *p = card;
	for(int i = 0;i < num;i++){
		p[i] = i + 1;
	}
	int count = 0;
	scanf("%d",&count);
	int location = 0;
	for(int i = 0;i < count;i++){
		scanf("%d",&location);
		int tmp = p[location - 1];
		for(int i = location - 2;i >= 0;i--){
			p[i + 1] = p[i]; 
		}
		p[0] = tmp;
		for(int i = 0;i < num;i++){
		}
	}
	printf("%d",p[0]);
}