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#include<bits/stdc++.h>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    string s;
    cin>>n>>s;
    int sumary=n/10, res=0, l=0;
    for(int i=0; i<n; i++)
    {
        if(s[i]==s[i+1])res++;
        if(res>sumary)
        {
            l++;
            res=0;
        }
    }
    cout<<l;
    return 0;
}