#include <iostream>
#include <string>
using namespace std;
 
int main() {
    int N;
    string S;
    cin >> N >> S;
 
    // Initialize the count with 1 (first character is always included)
    int count = 1;
 
    // Traverse the string and count characters that are different from the previous one
    for (int i = 1; i < N; ++i) {
        if (S[i] != S[i - 1]) {
            count++;
        }
    }
 
    cout << count << endl;
    return 0;
}

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