#include <bits/stdc++.h>
using namespace std;
 
int countOfSubarray(vector<int>& a , int x , int y){
	int n = a.size();
	for(int i=0;i<n;i++){
		a[i] = (a[i]==x)?1:-1;
	}
 
	// for(int x:a)cout<<x<<" ";
	cout<<endl;
 
	int ans=0;
	unordered_map<int,int>mpp;
	mpp[0] = 1;
	int prefixSum=0;
	for(int i=0;i<n;i++){
		prefixSum += a[i];
		ans += mpp[prefixSum];
		mpp[prefixSum]++;
	}
	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