//100p #include "fstream" std::ifstream cin("nevricos.in"); std::ofstream cout("nevricos.out"); long long Se, Ss, nr1, nr2; int main(){ char x, y; cin >> x; for(;cin >> y;){ if(x == '1') ++ nr1; else if(x == '2') ++ nr2; if(y == '5'){ Ss += nr1; if(x == '1') ++ Se; } else if(y == '4'){ Ss += nr2; if(x == '2') ++ Se; } x = y; } cout<