import std.stdio, std.conv, std.string, std.array, std.range, std.algorithm, std.container;
import std.math, std.random, std.bigint, std.datetime, std.format;
void main(string[] args){ if(args.length > 1) if(args[1] == "-debug") DEBUG = 1; solve(); }
void log()(){ writeln(""); } void log(T, A ...)(T t, lazy A a){ if(DEBUG) write(t, " "), log(a); } bool DEBUG = 0; 
string rstring(){ static string[] ss; while(!ss.length) ss = readln.chomp.split; string res = ss[0]; ss.popFront; return res; }
T rtype(T)(){ return rstring.to!T; } alias rint = rtype!int, rlong = rtype!long, rreal = rtype!real;
T[] rtypes(T)(int n){ return n.iota.map!(i => rtype!T()).array; } alias rint = rtypes!int, rlong = rtypes!long, rreal = rtypes!real;
T[][] rtypess(T)(int n, int m){ return n.iota.map!(i => rtypes!T(m)).array; } alias rint = rtypess!int, rlong = rtypess!long, rreal = rtypess!real;

// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- //

void solve(){
	string s = rstring;
	long k = rlong;
	long n = s.length;
	
	bool f = 0;
	long[] ans;
	long an = 0;
	char last = '0';
	
	ans ~= an;
	foreach(c; s){
		if(last != c) last = c;
		else an += 1, last = '0';
	}
	
	ans ~= an;
	foreach(c; s){
		if(last != c) last = c;
		else an += 1, last = '0';
	}
	
	ans ~= an;
	foreach(c; s){
		if(last != c) last = c;
		else an += 1, last = '0';
	}
	
	ans ~= an;
	foreach(c; s){
		if(last != c) last = c;
		else an += 1, last = '0';
	}
	
	ans ~= an;
	
	log("ans:", ans);
	
	if(k <= 4) ans[k].writeln;
	else if(k % 2 > 0){
		(ans[1] + (ans[3] - ans[1]) * ((k - 1) / 2)).writeln;
	}
	else{
		(ans[2] + (ans[4] - ans[2]) * ((k - 2) / 2)).writeln;
	}
}
