#include<bits/stdc++.h> using namespace std; int main(){ int i,n,m,x,c=0; float b=0; int a[30]={0}; cin>>n; for(i=0;i<n;i++) cin>>a[i]; cin>>x; for(i=0;i<n;i++){ if(a[i]==x) c++; } b=c*1.0/n; printf("%.2f ",b); return 0; } /************************************************************** Problem: 1354 User: wtq001 Language: C++ Result: Accepted Time:10 ms Memory:2072 kb ****************************************************************/