#include <bits/stdc++.h>
using namespace std;
#define LL long long

#define N 100007
char b[N];
int cnt,pos[N<<1],que[N<<1],h=1,t;

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0),cout.tie(0);
	
	cin>>b;
	int n=strlen(b),s;
	cin>>s;
	for(int i=0;i<n;i++) if(b[i]=='E') pos[++cnt]=i+1;
	for(int i=1;i<=cnt;i++) pos[i+cnt]=pos[i]+n;
	cnt<<=1;
	int ptr=1;LL Ans=0;
	while(ptr<=cnt&&pos[ptr]<s) que[++t]=pos[ptr],ptr++;
	for(int i=1;i<=n;i++){
		if(pos[ptr]==i+s-1) que[++t]=pos[ptr],ptr++;
		if(h<=t&&que[h]==i-1) h++;
		Ans+=h<=t?s-(que[h]-i):0;
	}
	cout<<Ans<<'\n';
	
	return 0;
}
/*
PEP
1
*/