/
taxa.cpp
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/
taxa.cpp
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#include<bits/stdc++.h>
#define inf 1e15
#define int long long
#define N 210
using namespace std;
int n;
int s[N][N], dp[N][N];
double f;
int m(int x){
return (x+n-1) % n;
}
int sum(int i, int j){
if(s[i][j] != -1) return s[i][j];
return s[i][j] = sum(i, m(j)) + s[j][j];
}
int solve(int i, int j){
if(dp[i][j] != -1) return dp[i][j];
dp[i][j] = inf;
for(int k = j;k != i;k = m(k)){
dp[i][j] = min(dp[i][j], solve(i, m(k)) + solve(k, j) + max(sum(i, m(k)), sum(k, j)));
}
return dp[i][j];
}
int32_t main(){
cin >> n >> f;
memset(dp, -1, sizeof dp);
memset(s, -1, sizeof s);
for(int i = 0;i < n;i++){
cin >> s[i][i];
dp[i][i] = 0;
}
int res = inf;
for(int i = 0;i < n;i++){
res = min(res, solve(i, m(i)));
}
cout << fixed << showpoint;
cout << setprecision(2) << res*f << "\n";
return 0;
}