#include <iostream>
using namespace std;
short int grop[24];
int main() {
for(int i=0; i<=sizeof(grop)/2-1; ++i)
{
cin >> grop[i];
grop[sizeof(grop)/2] += grop[i];
}
for(int i=0; i<=sizeof(grop)/2-1; ++i)
if(grop[i]<grop[0])
{
if(grop[i]>grop[sizeof(grop)/2-1])
grop[sizeof(grop)/2] = grop[i];
grop[0] = grop[i];
}
else if(grop[i]>grop[sizeof(grop)/2-1])
grop[sizeof(grop)/2-1] = grop[i];
//cout << grop[sizeof(grop)/2]*1.f/grop[0]*100;
cout << grop[sizeof(grop)/2]*1.f/(sizeof(grop)/2)/grop[0]*100.f;
return 0;
}
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