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#include <iostream>
#include <string>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,wynik=0,T=0;
    string roz;
    cin>>n;
    cout<<endl;
    cin>>roz;

    for(int i=0; i<=n; i++)
    {
        if(roz[i]=='T')
        {
            if(n==10)
            {
                wynik++;
            }
            if(n==20&&roz[i+1]=='T')
            {
                wynik++;
            }
            if(n==30&&roz[i+1]=='T'&&roz[i+2]=='T')
            {
                wynik++;
            }
            if(n==40&&roz[i+1]=='T'&&roz[i+2]=='T'&&roz[i+3]=='T')
            {
                wynik++;
            }
            if(n==50&&roz[i+1]=='T'&&roz[i+2]=='T'&&roz[i+3]=='T'&&roz[i+4]=='T')
            {
                wynik++;
            }
            if(n==60&&roz[i+1]=='T'&&roz[i+2]=='T'&&roz[i+3]=='T'&&roz[i+4]=='T'&&roz[i+5]=='T')
            {
                wynik++;
            }
            if(n==70&&roz[i+1]=='T'&&roz[i+2]=='T'&&roz[i+3]=='T'&&roz[i+4]=='T'&&roz[i+5]=='T'&&roz[i+6]=='T')
            {
                wynik++;
            }
            if(n==80&&roz[i+1]=='T'&&roz[i+2]=='T'&&roz[i+3]=='T'&&roz[i+4]=='T'&&roz[i+5]=='T'&&roz[i+6]=='T'&&roz[i+7]=='T')
            {
                wynik++;
            }
            if(n==90&&roz[i+1]=='T'&&roz[i+2]=='T'&&roz[i+3]=='T'&&roz[i+4]=='T'&&roz[i+5]=='T'&&roz[i+6]=='T'&&roz[i+7]=='T'&&roz[i+8]=='T')
            {
                wynik++;
            }
            if(n==100&&roz[i+1]=='T'&&roz[i+2]=='T'&&roz[i+3]=='T'&&roz[i+4]=='T'&&roz[i+5]=='T'&&roz[i+6]=='T'&&roz[i+7]=='T'&&roz[i+8]=='T'&&roz[i+9]=='T')
            {
                wynik++;
            }
            }
            }

    cout<<wynik;
    return 0;
}