#include <bits/stdc++.h>   using namespace std;   template <class T>   bool uin(T &a, T b) {     return (a > b ? a = b, true : false);   }   template <class T>   bool uax(T &a, T b) {     return (a < b ? a = b, true : false);   }   int const X = 8;   int const L = 26;   int const N = 41;   long long const INF = 3e18 + 41;   int x, k, n, q;   int c[N];   int p[N], w[N];   long long d[(1 << X)][(1 << X)][L];   long long ans;   bool bit(int m, int i) { return (m & (1 << i)); }   int xorbit(int m, int i) { return (m ^ (1 << i)); }   int qbit(int m) {     int res = 0;     while (m) {       res += (m & 1);       m /= 2;     }     return res;   }   int dx[(1 << X)][(1 << X)];   unordered_map<int, int> a;   vector<pair<int, long long>> e[(1 << X)][L];   void build() {     for (int i = 0; i < (1 << X); ++i)       for (int j = 0; j < (1 << X); ++j)         for (int o = 0; o < L; ++o) d[i][j][o] = INF;     memset(dx, 255, sizeof(dx));     for (int i = 0; i < (1 << k); ++i) {       if (!bit(i, 0)) {         int m0 = i;         int m1 = (m0 >> 1);         uin(d[m0][m1][0], 0ll);       } else {         int m0 = i;         for (int j = 1; j < k + 1; ++j) {           if (bit(m0, j)) continue;           int m1 = xorbit(m0, j);           m1 = xorbit(m1, 0);           m1 >>= 1;           if (uin(d[m0][m1][0], (long long)c[j - 1])) dx[m0][m1] = j;         }       }     }     for (int o = 1; o < L; ++o) {       for (int t = 0; t < (1 << k); ++t) {         if (qbit(t) != x) continue;         for (int i = 0; i < (1 << k); ++i) {           if (qbit(i) != x) continue;           for (int j = 0; j < (1 << k); ++j) {             if (qbit(j) != x) continue;             uin(d[i][j][o], d[i][t][o - 1] + d[t][j][o - 1]);           }         }       }     }     for (int o = 0; o < L; ++o) {       for (int i = 0; i < (1 << X); ++i)         for (int j = 0; j < (1 << X); ++j)           if (d[i][j][o] < INF) {             if (qbit(i) != x) continue;             e[i][o].push_back(make_pair(j, d[i][j][o]));           }     }   }   long long f[(1 << X)], nf[(1 << X)];   void solve() {     int p1 = 0;     int x0 = 0;     for (int i = 0; i < (1 << X); ++i) f[i] = INF;     f[(1 << x) - 1] = 0;     while (x0 < n - x) {       while (p1 < q && x0 > p[p1]) ++p1;       int s;       for (int i = L - 1; i >= 0; --i) {         s = i;         if (x0 + (1 << i) + k - 1 > n - 1) continue;         if (p1 != q && x0 + (1 << i) + k - 1 >= p[p1]) continue;         break;       }       for (int i = 0; i < (1 << k); ++i) nf[i] = INF;       for (int i = 0; i < (1 << k); ++i) {         if (f[i] == INF) continue;         for (pair<int, long long> p : e[i][s]) {           long long v = f[i] + p.second;           if (s == 0 && dx[i][p.first] != -1 &&               a.find(x0 + dx[i][p.first]) != a.end()) {             v += a[x0 + dx[i][p.first]];           }           uin(nf[p.first], v);         }       }       memcpy(f, nf, sizeof(f));       x0 += (1 << s);     }     ans = f[(1 << x) - 1];   }   int main() {     scanf( %d %d %d %d , &x, &k, &n, &q);     for (int i = 0; i < k; ++i) scanf( %d , &c[i]);     for (int i = 0; i < q; ++i) {       scanf( %d %d , &p[i], &w[i]);       --p[i];       a[p[i]] = w[i];     }     for (int i = 0; i < q; ++i)       for (int j = i + 1; j < q; ++j)         if (p[j] < p[i]) {           swap(p[j], p[i]);           swap(w[j], w[i]);         }     build();     solve();     printf( %I64d n , ans);     return 0;   }