#define _USE_MATH_DEFINES
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
using namespace std;
typedef long long ll;
const int mod=1e9+7;
int main(){
	int n,m,a;
	cin>>n>>m;
	int arr[50];
	iota(arr,arr+n,0);
	while(cin>>a)
		rotate(arr,arr+a-1,arr+n);
	cout<<arr[0]+1<<endl;
}