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#include <iostream>
#include <cstdio>

using namespace std;

int main() {
    int n;
    char tests[100];
    int countT, result;
    countT = result = 0;

    scanf("%d", &n);
    scanf("%s", tests);

    for(int i = 0; i < n; i++) {
        if(tests[i] == 'T') {
            countT++;
        } 

        if((i + 1) % (n / 10) == 0) {
            if(countT == n / 10) {
                result++;
            }

            countT=0;
        }
    }

    printf("%d\n", result);
    
    return 0;
}