#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <cstring>

using namespace std;

typedef long long LL;
typedef vector<LL> VL;
typedef vector<vector<LL>> VVL;
typedef vector<string> VS;

#define REPD(i,a,b) for (LL i=(a);i<(b);i++)
#define REP(i,n) REPD(i,0,n)

LL llRead(){
  LL a;
  cin >> a;
  return a;
};

string stringRead(){
  string a;
  cin >> a;
  return a;
};

vector<LL> vlRead(LL a){
  vector<LL> rv;
  REP(i, a){
    LL input;
    cin >> input;
    rv.push_back(input);
  }
  return rv;
}

vector<string> vsRead(LL a){
  vector<string> rv;
  REP(i, a){
    string input;
    cin >> input;
    rv.push_back(input);
  }
  return rv;
}
vector<vector<LL>> vvlRead(LL a, LL b){
  vector<vector<LL>> rv;
  REP(i, a){
    rv.push_back(vector<LL>());
    REP(j, b) {
      LL input;
      cin >> input;
      rv.at(i).push_back(input);
    }
  }
  return rv;
}

#if 1
#define debug(d) debug1(__LINE__,#d, d)
void debug1(LL line, const char* name, VL& v) {
  cout << line << ":" << name << ":vector<LL>(" << v.size() << ") ";
  REP(i, (LL)v.size()) {
    cout << v.at(i) << " ";
  }
  cout << endl;
}
void debug1(LL line, const char* name, LL i) {
  cout << line << ":" << name << ":LL " << i << endl;;
}
void debug1(LL line, const char* name, VS& v) {
  cout << line << ":" << name << ":vector<string>(" << v.size() << ") ";
  REP(i, (LL)v.size()) {
    cout << v.at(i) << " ";
  }
  cout << endl;
}
void debug1(LL line, const char* name, VVL& v) {
  cout << line << ":" << name << ":vector<vector<LL>>(" << v.size() << ") ";
  REP(i, (LL)v.size()) {
    REP(j, (LL)v.at(i).size()) {
      cout << v.at(i).at(j) << " ";
    }
    cout << ", ";
  }
  cout << endl;
}
void debug1(LL line, const char* name, char* s) {
  cout << line << ":" << name << ":char* " << s << endl;;
}
void debug1(LL line, const char* name, vector<const char*>& v) {
  cout << line << ":" << name << ":vector<const char*>(" << v.size() << ") ";
  REP(i, (LL)v.size()) {
    cout << v.at(i) << " ";
  }
  cout << endl;
}
void debug1(LL line, const char* name, priority_queue<LL>& p) {
  cout << line << ":" << name << ":priority_queue<LL>(" << p.size() << ") ";
  priority_queue<LL> copy = p;
  while(!copy.empty()) {
    cout << copy.top() << " ";
    copy.pop();
  }
  cout << endl;
}
#else
#define debug(n)
#endif

int main(int argc, const char * argv[]) {
	cout.precision(16);
  // source code

  auto s = stringRead();
  auto k = llRead();
  if (s.size() == 1) {
    cout << k/2 << endl;
    return 0;
  }
  bool allsame = true;
  for (int i=1;i<s.size();i++) {
    if (s[i-1] != s[i]) {
      allsame =false;
      break;
    }
  }
  if (allsame) {
    cout << s.size() * k / 2 << endl;
    return 0;
  }

  bool changeLast = false;
  LL changes = 0;
  for (int i=1;i<s.size();i++) {
    if (!changeLast && s[i-1] == s[i]) {
      changeLast = true;
      changes++;
    } else {
      changeLast = false;
    }
  }
  if (!changeLast && s[0] == s[s.size()-1]) {
    int fn = 1;
    for (int i = 1;i<s.size();i++) {
      if (s[i-1] == s[i]) {
        fn++;
      }else {
        break;
      }
    }
    if (fn%2 == 0) {
      cout << changes * k << endl;
    } else {
      cout << changes * k + k-1 << endl;
    }
  } else {
    cout << changes * k << endl;
  }

  return 0;
}


Measured memory_bytes: 384