include[HTML_REMOVED]

using namespace std;

const int maxn=1e5+5;
const double eps=1e-4;
int a[maxn];
int n,m;

bool check(double x)
{
int c=0;
for(int i=0;i[HTML_REMOVED]=m) return true;
return false;
}

int main()
{
cin>>n>>m;
for(int i=0;i[HTML_REMOVED]>a[i];
}
double left=0,right=1e9;
while(right-left>eps)
{
double m=left+(right-left)/2;
if(check(m)) left=m;
else right=m;
}
printf(“%.2f\n”,left);
return 0;
}