# -*- coding: utf-8 -*-

def main():

    N = int(input())
    S = input()

    ans = 1

    for i in range(N - 1):
        if S[i] != S[i + 1]:
            ans += 1

    print(ans)


if __name__ == "__main__":
    main() def main():

    N = int(input())
    S = input()

    ans = 1

    for i in range(N - 1):
        if S[i] != S[i + 1]:
            ans += 1

    print(ans) main N = int(input()) N int(input()) int input() input S = input() S input() input ans = 1 ans 1 for i in range(N - 1):
        if S[i] != S[i + 1]:
            ans += 1

     i range(N - 1) range N - 1 N 1 if S[i] != S[i + 1]:
            ans += 1

     S[i] != S[i + 1] S[i] S i S[i + 1] S i + 1 i 1 ans += 1 ans 1 print(ans) print ans if __name__ == "__main__":
    main() __name__ == "__main__" __name__ "__main__" main() main def main():

    N = int(input())
    S = input()

    ans = 1

    for i in range(N - 1):
        if S[i] != S[i + 1]:
            ans += 1

    print(ans) def main():

    N = int(input())
    S = input()

    ans = 1

    for i in range(N - 1):
        if S[i] != S[i + 1]:
            ans += 1

    print(ans) main
# -*- coding: utf-8 -*-

def main():

    N = int(input())
    S = input()

    ans = 1

    for i in range(N - 1):
        if S[i] != S[i + 1]:
            ans += 1

    print(ans)


if __name__ == "__main__":
    main()