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#include<cstdio>
#include<vector>
#include<iostream>

int main() {

    int n;
    char c;
    int sum = 0;

    scanf("%d\n", &n);
    n /= 10;

    for (int i = 0; i < 10; ++i) {
        bool ok = true;
        for (int j = 0; j < n; ++j) {
            c = getchar();
            ok = ok & (c == 'T');
        }
        sum += ok;
    }

    printf("%d\n", sum);

    return 0;
}