6.3.1

#include <iostream>

using namespace std;

int Serch(int A[],int n,int x)
{
    for (int i=0;i<n;i++)
    {
        if (A[i]==x) return i;
    }
    return -1;
}

int main()
{
    int n,x;
    int *A;
    cin>>n;
    A=new int [n];
    for (int i=0;i<n;i++)
    {
        cin>>A[i];
    }
    cin>>x;
    cout<<Serch(A,n,x);
    return 0;
}