#include <bits/stdc++.h>
using namespace std;
 
int countOfSubarray(vector<int>& a , int x , int y){
	int n = a.size();
	unordered_map<int,int>freq;
	int ans = 0;
	freq[0] = 1;
	int diff = 0;
	int cx = 0 , cy = 0;
	for(int i=0;i<n;i++){
		if(a[i]==x)cx++;
		else cy++;
		diff = cx-cy;
		ans += freq[diff];
		freq[diff]++;
	}
	return ans;
}
 
int main() {
	int n;
	cin>>n;
	int x,y;
	cin>>x>>y;
	vector<int>a(n);
	for(int i=0;i<n;i++){
		cin>>a[i];
	}
	cout<<countOfSubarray(a,x,y);
	return 0;
}

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NwoyIDMKMiAzIDMgMiAyIDMgMg==

7
2 3
2 3 3 2 2 3 2