#include <iostream>
#include <fstream>

using namespace std;

ifstream f("bac.in");

int main()
{
    int x,y;
    f>>x;
    while(y!=x)
        f>>y;
    int nr=0;
    int ok=0;
    int contor=0;
    while(f>>y)
    {
        if(y==x)
        {
            ok=1;
            contor=nr;
        }
        if(y%2==1)
            nr++;
    }
    if(ok==0)
        cout<<"Nu exista";
    else
        cout<<contor;
    return 0;
}