We define str = [s, n] as the string str which consists of the string s concatenated n times. For example, str == [ "abc ", 3] == "abcabcabc ". We define that string s1 can be obtained from string s2 if we can remove some characters from s2 such that it becomes s1. For example, s1 = "abc " can be obtained from s2 = "abdbec " based on our definition by removing the bolded underlined characters. You are given two strings s1 and s2 and two integers n1 and n2. You have the two strings str1 = [s1, n1] and str2 = [s2, n2]. Return the maximum integer m such that str = [str2, m] can be obtained from str1.