def main():
    
    N = int(input())
    array = [list(map(int,input().split())) for _ in range(N)]
    array.sort(key = lambda x:x[1], reverse=True)
    array.sort(key = lambda x:x[0], reverse=True)
    ans = 0
    now = array[0][0]
    #print(array)
    for r,R in array[1:]:
        if R <= now:
            now = r
        else:
            ans += 1
    print(ans)
    


if __name__ == '__main__':
    main()