#include <bits/stdc++.h>
using namespace std;

void MaxSubsequence () {

    int size;
    cin>>size;
    string value;

    cin>>value;
    char temp;
    int counter = 0;
    for(int i=0;i<size;i++){
        if(i == 0){
            temp = value[i];
            counter++;
        } else {
            if(value[i] != temp){
                counter++;
                temp = value[i];
            }
        }
    }
    cout<<counter;
}
int main() {
    MaxSubsequence();
    return 0;
}