#include <bits/stdc++.h>

const long long INF = 1e9;
const long long MOD = 1e9 + 7;
//const long long MOD = 998244353;
const long long LINF = 1e18;
using namespace std;

#define YES(n) cout << ((n) ? "YES" : "NO"  ) << endl
#define Yes(n) cout << ((n) ? "Yes" : "No"  ) << endl
#define POSSIBLE(n) cout << ((n) ? "POSSIBLE" : "IMPOSSIBLE"  ) << endl
#define Possible(n) cout << ((n) ? "Possible" : "Impossible"  ) << endl
#define dump(x)  cout << #x << " = " << (x) << endl
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) for(int i=0;i<(n);++i)
#define REPR(i,n) for(int i=n;i>=0;i--)
#define COUT(x) cout<<(x)<<endl
#define SCOUT(x) cout<<(x)<<" "
#define VECCOUT(x) for(auto&youso_: (x) )cout<<right<<setw(10)<<youso_<<" ";cout<<endl
#define ENDL cout<<endl
#define CIN(...) int __VA_ARGS__;CINT(__VA_ARGS__)
#define LCIN(...) long long __VA_ARGS__;CINT(__VA_ARGS__)
#define SCIN(...) string __VA_ARGS__;CINT(__VA_ARGS__)
#define VECCIN(x) for(auto&youso_: (x) )cin>>youso_
#define mp make_pair
#define PQ priority_queue<long long>
#define PQG priority_queue<long long,V,greater<long long>>


typedef long long ll;
typedef vector<long long> vl;
typedef vector<long long> vi;
typedef vector<bool> vb;
typedef vector<char> vc;
typedef vector<vl> vvl;
typedef vector<vi> vvi;
typedef vector<vb> vvb;
typedef vector<vc> vvc;
typedef pair<long long, long long> pll;


#define COUT(x) cout<<(x)<<endl
void CINT(){}
template <class Head,class... Tail>
void CINT(Head&& head,Tail&&... tail){
    cin>>head;
    CINT(move(tail)...);
}
template<class T>
void mod(T &x) {
    x %= MOD;
    x += MOD;
    x %= MOD;
}

ll GCD(ll a, ll b) {
    if(b == 0) return a;
    else return GCD(b, a%b);
}

struct COMB{
    vl fact, fact_inv, inv;
    void init_nCk(long long SIZE) {
        fact.resize(SIZE + 5);
        fact_inv.resize(SIZE + 5);
        inv.resize(SIZE + 5);
        fact.at(0) = fact.at(1) = fact_inv.at(0) = fact_inv.at(1) = inv.at(1) = 1;
        for(long long i = 2; i < SIZE + 5; i++) {
            fact.at(i) = fact.at(i - 1)*i%MOD;
            inv.at(i) = MOD - inv.at(MOD%i)*(MOD/i)%MOD;
            fact_inv.at(i) = fact_inv.at(i - 1)*inv.at(i)%MOD;
        }
    }
    long long nCk (long long n, long long k) {
        assert(!(n < k));
        assert(!(n < 0 || k < 0));
        return fact.at(n)*(fact_inv.at(k)*fact_inv.at(n - k)%MOD)%MOD;
    }
};
ll extGCD(ll a, ll b, ll &x, ll &y) {
    if(b == 0) {
        x = 1;
        y = 0;
        return a;
    }
    ll d = extGCD(b, a%b, y, x);
    y -= a/b*x;
    return d;
}


string solve(string s) {
    string res;
    sort(s.begin(),s.end());
    string memo = s;
    reverse(s.begin(),s.end());
    res = to_string(abs(stoi(s) - stoi(memo)));
//    cout << res << endl;
    return res;
}

void Main() {
    LCIN(N, K);
    string S = to_string(N);
    for(int i = 0; i < K; i++) {
        S = solve(S);
    }
    cout << S << endl;
}

int main() {
    cout << fixed << setprecision(15);
    Main();
    return 0;
}
#pragma comment(linker, "/STACK:1000000000")
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops")
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <algorithm>
#include <memory.h>
#include <cassert>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <cmath>
#include <ctime>
#include <random>
#include <bitset>
#include <limits.h>
#include <fstream>

#define mp make_pair
#define all(a) (a).begin(), (a).end()
#define pll pair <ll, ll>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef long double ld;
#define uint unsigned int
#define mp make_pair

const int maxn = 110;
vector <int> ed[maxn];

bool used[maxn];

int dfs(int v) {
    if (used[v]) {
        return 0;
    }

    int ans = 1;
    used[v] = true;

    for (int u : ed[v]) {
        ans += dfs(u);
    }
    return ans;
}

int main() {
    int n;
    cin >> n;
    string s;
    for (int i = 0; i < n; i++) {
        cin >> s;

        for (int j = 0; j < n; j++) {
            if (s[j] == '1') {
                ed[j].push_back(i);
            }
        }
    }

    ld ans = 0;

    for (int i = 0; i < n; i++) {
        memset(used, 0, sizeof used);
        ld num = dfs(i);
        ans += 1. / num;
    }

    printf("%.10lf\n", (double)ans);
}