#include <iostream>

#include <cstdio>

#include <cstring>

using namespace std;

int n;

char s[];

int main() {

    scanf("%d",&n);

    char c;

    for(int i=;i<n;i++) scanf(" %c",&c),s[i]=c;

    int i=,j=,k=;

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

        s[(i+k)%n]-s[(j+k)%n];

        if(s[(i+k)%n]==s[(j+k)%n]) k++;

        else {

            if(s[(i+k)%n]>s[(j+k)%n]) i=i+k+;

            else if(s[(i+k)%n]<s[(j+k)%n]) j=j+k+;

            if(i==j) j++;

            k=;

        }

    }

    printf("%d\n",min(i,j));

}