public void Solve()
{
int N = NextInt();
var list = new Li();
N.REP(i => list.Add(NextInt()));
new ti3(0, N - 1, 1).FOR(i =>
{
if (list[i] % 2 != 1)
{
return;
}
if (list[i + 1] <= 0)
{
return;
}
list[i]++;
list[i + 1]--;
});
list.Select(x => (long)x / 2L).Sum().WL();
}
public void Solve()
{
int N = NextInt();
var A = new Li();
N.REP(i => A.Add(NextInt()));
for (int i = 0; i < N - 1; i++)
{
if (A[i] % 2 == 0)
{
continue;
}
if (A[i + 1] <= 0)
{
continue;
}
A[i]++;
A[i + 1]--;
}
A.Select(x => (long)x / 2).Sum().WL();
return;
}