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#include <iostream>
#include <numeric>
#include <vector>
using namespace std;
struct trans;
using state = pair<trans,trans>;
struct trans {
int w, m;
state *n;
};
enum {
L = -1,
R = +1
};
int main() {
int l = 12399302;
state A, B, C, D, E, F;
A = {{1, R, &B}, {0, R, &C}};
B = {{0, L, &A}, {0, R, &D}};
C = {{1, R, &D}, {1, R, &A}};
D = {{1, L, &E}, {0, L, &D}};
E = {{1, R, &F}, {1, L, &B}};
F = {{1, R, &A}, {1, R, &E}};
state *s = &A;
vector<int> v(20'000, 0);
auto head = begin(v) + 10'000;
for (int i = 0; i < l; i++) {
trans &t = *head == 0 ? s->first : s->second;
*head = t.w;
head += t.m;
s = t.n;
}
cout << accumulate(begin(v), end(v), 0) << endl; // 2794
}
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