import java.util.Scanner;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext 和 hasNextLine 的区别
while (in.hasNextInt()) { // 注意 while 处理多个 case
int a = in.nextInt();
String s = Integer.toBinaryString(a);
String[] ary = {"1","11","111","1111","11111","111111","1111111","11111111"};
int num = 0;
for(int i = 0;i <8;i++){
if(s.contains(ary[i])){
num = ary[i].length();
}
}
System.out.println(num);
}
}
}

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