#include<bits/stdc++.h>
using namespace std;
int main()
{
int t, j = 1;
cin >> t;
while(t--)
{
int n, p = 0;
string s;
cin >> n >> s;
for(int i=0;i<s.size();i++)
{
if(s[i] >='1' && s[i] <= '9')
p = s[i] - '0';
}
double ans = 0.5*n + 0.05*p;
cout << "Case " << j++ << ": " << ans << "\n";
}
return 0;
}
using namespace std;
int main()
{
int t, j = 1;
cin >> t;
while(t--)
{
int n, p = 0;
string s;
cin >> n >> s;
for(int i=0;i<s.size();i++)
{
if(s[i] >='1' && s[i] <= '9')
p = s[i] - '0';
}
double ans = 0.5*n + 0.05*p;
cout << "Case " << j++ << ": " << ans << "\n";
}
return 0;
}
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