学步园

/*
ID:wconvey
PROG: beads
LANG: C++

*/
#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
	char s[1200],lchar,rchar;
	int l,r,i,j,k,n,temp1=0,temp2=0,max=0;
	freopen("beads.in","r",stdin);
	freopen("beads.out","w",stdout);
	scanf("%d",&n);
	scanf("%s",s);
	for(i=0,j=n,k=2*n;i<n;i++,j++,k++)
		s[j]=s[k]=s[i];
/*	for(i=0;i<3*n;i++)
		printf("%c",s[i]);
	printf("\n\n");*/
    for(i=n;i<2*n;i++)//找左边
	{
		temp1=0,temp2=0,l=r=0;
		for(j=1;j<=n;j++)
		{
			if(s[i-j]=='w')
				l++;
			else 
			{
				if(temp1==0)
				{ lchar=s[i-j];l++;temp1=1; }
				else
					if(lchar==s[i-j])
						l++;
					else
						break;
			}
		}
		for(j=0;j<n-l;j++)//找右边
		{
			if(s[i+j]=='w')
				r++;
			else 
			{
				if(temp2==0)
				{ rchar=s[i+j];r++;temp2=1; }
				else
					if(rchar==s[i+j])
						r++;
					else
						break;
			}
		}
		if(r+l>max)
			max=r+l; 
	}
	printf("%d\n",max);
	return 0;
}