#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <iomanip>
using namespace std;
int main(void){
	int n;
	char x;
	cin>>n>>x;
	int i, count=0;
	char a[1000000];
	for(i=1;i<=n;i++){
		cin>>a[i];
		if(a[i]==x){
			count++;
		}
	}
	cout<<count<<endl;
    return 0;
}