#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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NTYKODUKMzUKNTMKNTYKODUKMzQKMjMKNTkKNTAKODMKMzQKOTEKNTYKOQoyNwozNAo2MwoyMwo2Mwo3Ngo2Nwo0MwozNgo=

56
85
35
53
56
85
34
23
59
50
83
34
91
56
9
27
34
63
23
63
76
67
43
36