#include
using namespace std;

int a[105];

int main()
{
int n,m;
cin >> n;
for (int i = 1; i <= n; i ++)
{
cin >> a[i];
}
cin >> m;
for (int i = 1; i <= n; i ++)
{
if (a[i] == m)
{
cout << i;
return 0;
}
}
cout << -1;

return 0;

}

简单循环