#include<iostream>
#include<fstream>
using namespace std;
ifstream fin("nr.in");
ofstream fout("nr.out");
int v[805];
int N,s,d,mij,x,n;
int main()
{

    fin>>x;
    fin>>n;
    for(int i=0;i<n;i++)
    {
        fin>>v[i];
        }
    s=1;
    d=n;
    while(s<=d)
    {
        mij=(s+d)/2;
        if(v[mij]>x)
            d=mij-1;
        else if(v[mij]==x)
        {
            fout<<mij;
            break;
        }
        else
            s=mij+1;
    }
    //fout<<x;
}