#include // clang-format off using Int = long long; #define REP_(i, a_, b_, a, b, ...) for (Int i = (a), lim##i = (b); i < lim##i; i++) #define REP(i, ...) REP_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__) struct SetupIO { SetupIO() { std::cin.tie(nullptr), std::ios::sync_with_stdio(false), std::cout << std::fixed << std::setprecision(13); } } setup_io; #ifndef _MY_DEBUG #define dump(...) #endif // clang-format on /** * author: knshnb * created: Fri Apr 17 21:50:59 JST 2020 **/ template inline bool chmin(T& a, const T& b) { if (a <= b) return false; a = b; return true; } template inline bool chmax(T& a, const T& b) { if (a >= b) return false; a = b; return true; } const Int INF = 2e18; signed main() { Int n, K; std::cin >> n >> K; std::string T(3 * K + 100, '$'); REP(i, K) T[i] = 'J'; REP(i, K, 2 * K) T[i] = 'O'; REP(i, 2 * K, 3 * K) T[i] = 'I'; std::vector> ps(n); REP(i, n) std::cin >> ps[i].first >> ps[i].second; std::vector dp(3 * n + 100, INF); dp[0] = 0; REP(i, 3 * K) { for (auto& p : ps) { Int j = i, idx = 0; std::string& s = p.first; while (std::find(s.begin() + idx, s.end(), T[j]) != s.end()) { idx = std::find(s.begin() + idx, s.end(), T[j]) - s.begin() + 1; j++; } chmin(dp[j], dp[i] + p.second); } } std::cout << (dp[3 * K] == INF ? -1 : dp[3 * K]) << std::endl; }