#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <cstring>

typedef long long ll;
using namespace std;

#define mod 1000000007
#define INF 1000000000
#define LLINF 2000000000000000000LL
#define PI 3.1415926536

#define SIZE 1000

int main(){
    int cards[51],a;
    int n,m;
    
    scanf("%d%d",&n,&m);
    
    for(int i=1;i<=n;i++) cards[i] = i;
    
    for(int i=0;i<m;i++){
        scanf("%d",&a);
        
        int memo = cards[a];
        
        for(int i=a;i>0;i--){
            cards[i] = cards[i-1];
        }
        
        cards[1] = memo;
    }
    
    printf("%d\n",cards[1]);
}