#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>

using namespace std;

ifstream input_stream;
ofstream output_stream;




int main() {
	input_stream.open("input.txt");
	output_stream.open("output.txt");

	uint32_t N, K, R, P;
	input_stream >> N;
	input_stream >> K;
	input_stream >> R;

	uint32_t rounds[R] = {};

	for (uint32_t i = 0; i < R; i++) {
		input_stream >> rounds[i];
	}

	input_stream >> P;

	for (int i = R - 1; i >=0; i--) {
		if (P == N) {
			P = rounds[i];
		} else if (P >= rounds[i]) {
			P++;
		}
	}

	cout << P << endl;

	input_stream.close();
	output_stream.close();
	return 0;
}