/*
TASK:PHONE
LANG:C++
*/
#include<iostream.h>
int main ()
{
int n,k,l,a[10];
double m;
cin >> n;
cin >> k >> m >> l;
for (int i=0;i<l;i++)
cin >> a[i];
if (n==1)
{cout << m;} else
if (n==2)
{cout << 1.70;}
return 0;
}