#include <iostream>
#include <iomanip>

#include <algorithm>
#include <math.h>

#include <string>
#include <list>
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
/////////
typedef long long LL;
typedef long double LD;
/////////
using namespace::std;
/////////

int main(void){
	cin.tie(0);
	ios::sync_with_stdio(false);
	cout << fixed;//
	//cout << setprecision(6);//

	int N,M;
	cin >>N>>M;//N[1,50] M[1,100000=10^5]
	int A[100000];
	rep(i,M){
		cin>>A[i];//[1,50]
	}
	////////////
	list<int> intlist;
	rep(i,N){
		intlist.push_back(i+1);
	}
	int temp;
	int count;
	list<int>::iterator it;
	rep(i,M){//10^5
		it = intlist.begin();
		count = 0;
		while( count != A[i]-1){//50
			++count;
			++it;
		}
		temp = *it;
		intlist.erase(it);//50?
		intlist.push_front(temp);
	}
	it = intlist.begin();
	P(*it);
	return 0;
}