#include<stdio.h>
main(){
    int N,M;
    scanf("%d%d",&N,&M);
    int card[50];
    for(int i = 0;i < N;i++){
        card[i] = i+1;
    }
    for(int i = 0;i < M;i++){
        int index;
        scanf("%d",&index);
        int num = card[index-1];
        for(int j = index-1;j > 0;j--){
            card[j] = card[j-1];
        }
        card[0] = num;
    }
    printf("%d\n",card[0]);
}