#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)
#define Inf 1000000001


int main(){
	
	int N;
	cin>>N;
	
	vector<int> a(N);
	rep(i,N)cin>>a[i];
	
	vector<int> dp(N,0);
	dp.back() = N-1;
	for(int i=N-2;i>=0;i--){
		if(a[i+1]!=a[i]){
			dp[i] = dp[i+1];
		}
		else{
			dp[i] = i+1;
		}
	}
	long long ans=  0;
	rep(i,N){
		if(a[i]==0)continue;
		ans += dp[i] - i;
	}
	cout<<ans<<endl;
		
	return 0;
}