#include<bits/stdc++.h>

using namespace std;

int main( void )
{
    int N;
    cin >> N;
    string S;
    cin >> S;

    int ans = 1;
    for( int i = 1; i < N; i++ )
    {
        if( S[i - 1] != S[i] ) ans++;
    }
    
    cout << ans << endl;

    return 0;
}