//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include<queue>
using namespace std;
//conversion
//------------------------------------------
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}
//math
//-------------------------------------------
template<class T> inline T sqr(T x) {return x*x;}
//typedef
//------------------------------------------
typedef long long ll;
typedef long long LL;
typedef vector<int> VI;
typedef vector<long long > VLL;
typedef vector<long long > vll;
//container util
//------------------------------------------
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define VECMAX(x) *max_element(ALL(x))
#define VECMIN(x) *min_element(ALL(x))
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
//repetition
//------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define MULTIPLE(i,n,k) for(int i = (k) ; i<(n) ; i+=k+1)//倍数ループ
//constant
//------------------------------------------
const double EPS = 1e-10;
const double PI  = acos(-1.0);
//clear memory
#define CLR(a) memset((a), 0 ,sizeof(a))
//debug
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;
#define SIZEOF(x) sizeof(x)/sizeof(x[0])

const long long INF = 1000000000;





int main(){
    string s;
    cin>> s;
    ll k;
    cin >> k;
    vll a;
    ll num = 1;
    if(s.size()==1){
        cout<<k/2;
        return 0;
    }
    REP(i,s.size()-1){
        if(s[i] == s[i+1]){
            num++;
        }else{
            a.push_back(num);
            num = 1;
        }
        if(i==s.size()-2)a.push_back(num);
    }
    //REP(i,a.size())cout << " a[" << i << "] : " << a[i] << endl;
    ll count = 0;
    if(a.size()==1){
        cout<<(a[0]*k)/2;
        return 0;
    }
    if(s[0] == s[s.size()-1]){
        //cout << "here a[0] : " << a[0] << " a[a.size()-1] : " << a[a.size()-1] <<endl;
        count+=a[0]/2;
        count+=a[a.size()-1]/2;
        ll mem = a[0];
        a[0] = 0;
        
        a[a.size()-1]+=mem;
          //cout << "here a[0] : " << a[0] << " a[a.size()-1] : " << a[a.size()-1] <<endl;
        ll minus = a[a.size()-1]/2;
        ll ccc = 0;
        REP(i,a.size()){
            ccc+=a[i]/2;
        }
        ccc*=k;
        ccc-=minus;
        count+=ccc;
    }else{
        REP(i,a.size()){
            count+=a[i]/2;
        }
        count*=k;
    }

    cout << count;

    return 0;
    }


Measured memory_bytes: 384