#include<bits/stdc++.h> #include using namespace std;

int main() { int a,b[100000]; double c=0; cin>>a; for(int i=1;i<=a;i++){ cin>>b[i]; c=c+b[i]; } c=c/a; cout<<fixed<<setprecision(2)<<c; return 0; }

#include <bits/stdc++.h>
using namespace std;

int main() {
	int a, b[9999];
	double c;
	scanf("%d", &a);
	for (int i = 1; i <= a; i++) {
		scanf("%d", &b[i]);
		c += b[i];
	}
	printf("%.2lf", c / a * 1.0);
	return 0;
}

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