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;

    foreach (i; 0 .. M)
    {
        auto tmp = card[A[i] - 1];
        card[1 .. A[i]] = card[0 .. A[i] - 1].dup;
        card[0] = tmp;
    }
    card[0].writeln;
}