#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------

int N;
int S[202020][2];

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N;
	FOR(i,N) {
		cin>>x;
		S[i][i%2]+=x;
		S[i][(i%2)^1]+=x^1;
	}
	
	ll ret=0;
	int cur=0;
	x=(N-1)%2;
	for(i=N-1;i>=0;i--) {
		
		if(i<N-1&&S[i][x]==1) cur++;
		else cur=0;
		if(x==i%2) ret+=cur;
		
	}
	x^=1;
	cur=0;
	for(i=N-1;i>=0;i--) {
		if(i<N-1&&S[i][x]==1) cur++;
		else cur=0;
		if(x==i%2&&cur) ret+=cur;
	}
	cout<<ret<<endl;
	
	
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}