#include <iostream>
using namespace std;
int main() {
unsigned int i, n;
cin>>n>>i;
if (i<=n) {
double a, s, a_m;
for (int j = 0; j < n; j++) {
cin>>a;
if (j != i) {s+=a;}
}
a_m = s/(n-1);
cout<<"Ответ: "<<a_m;
}
else {cout<<"Условие задачи не выполнено";}
}
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