## https://yukicoder.me/problems/no/2796

MAX_INT = 10 ** 18

def main():
    N = int(input())
    rR = []
    for _ in range(N):
        r, R = map(int, input().split())
        rR.append((r, R))
    
    rR.sort(key=lambda x : x[0], reverse=True)

    ans = 0
    min_r = MAX_INT
    for r, R in rR:
        if min_r >= R:
            ans += 1
            min_r = r
    
    print(N - ans)



    



if __name__ == "__main__":
    main()