import java.io.BufferedReader;

 import java.io.IOException;

 import java.io.InputStreamReader;

 import java.util.Scanner;

 public class Main {

     public static void main(String args[]) throws IOException {

         Scanner sc=new Scanner(System.in);

         int num=sc.nextInt();

         char[] c=new char[num];

         String str;

         int ll;

         int now=0;

         while(sc.hasNext()) {

             str=sc.next();

             ll=str.length();

             for(int n=0;n<ll;++n)

                 c[now+n]=str.charAt(n);

             now+=ll;

             if(now==num)

                 break;

         }

         System.out.print(res(c,num));

     }

     public static int res(char[] c,int len) {

         int i=0,j=1,k=0;

         while(i<len&&j<len&&k<len) {

             if(c[(i+k)%len]==c[(j+k)%len])

                 k++;

             else if(c[(i+k)%len]<c[(j+k)%len]) {

                 j=j+k+1;

                 k=0;

             }

             else {

                 i=j;

                 j=i+1;

                 k=0;

             }

         }

         return i;

     }

 }