import std.stdio,
       std.conv,
       std.string,
       std.range,
       std.math,
       std.algorithm;

void main()
{
    auto input = readln.split.to!(int[]);
    auto N = input[0], M = input[1];
    auto A = readln.split.to!(int[]);
    auto card = 1.iota(N + 1).array;

    A.each!(i => card=card[i-1]~card[0..i-1]~card[i..$]);
    card[0].writeln;
}