package q0xx; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Arrays; import java.util.InputMismatchException; public class Q15_2 { static InputStream is; static PrintWriter out; static String INPUT = ""; static void solve() { int n = ni(), v = ni(); int sc = ni()-1, sr = ni()-1; int tc = ni()-1, tr = ni()-1; int[][] a = new int[n][]; for(int i = 0;i < n;i++){ a[i] = na(n); } v = Math.min(v, 1800); int[][][] dp = new int[v][n][n]; int I = 99999999; for(int i = 0;i < v;i++){ for(int j = 0;j < n;j++){ Arrays.fill(dp[i][j], I); } } int[] q = new int[1801*n*n]; int p = 0; int o = 0; q[p++] = 0<<14|sr<<7|sc; dp[0][sr][sc] = 0; int[] dr = { 1, 0, -1, 0 }; int[] dc = { 0, 1, 0, -1 }; while(o < p){ int cur = q[o++]; int dmg = cur>>>14, r = cur>>>7&127, c = cur&127; for(int k = 0;k < 4;k++){ int nr = r + dr[k], nc = c + dc[k]; if(nr >= 0 && nr < n && nc >= 0 && nc < n){ int ndmg = dmg + a[nr][nc]; if(ndmg < v && dp[ndmg][nr][nc] > dp[dmg][r][c] + 1){ dp[ndmg][nr][nc] = dp[dmg][r][c] + 1; q[p++] = ndmg<<14|nr<<7|nc; } } } } int mind = I; for(int i = v-1;i >= 0;i--){ mind = Math.min(mind, dp[i][tr][tc]); } out.println(mind == I ? -1 : mind); } public static void main(String[] args) throws Exception { long S = System.currentTimeMillis(); is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes()); out = new PrintWriter(System.out); solve(); out.flush(); long G = System.currentTimeMillis(); tr(G-S+"ms"); } private static boolean eof() { if(lenbuf == -1)return true; int lptr = ptrbuf; while(lptr < lenbuf)if(!isSpaceChar(inbuf[lptr++]))return false; try { is.mark(1000); while(true){ int b = is.read(); if(b == -1){ is.reset(); return true; }else if(!isSpaceChar(b)){ is.reset(); return false; } } } catch (IOException e) { return true; } } private static byte[] inbuf = new byte[1024]; static int lenbuf = 0, ptrbuf = 0; private static int readByte() { if(lenbuf == -1)throw new InputMismatchException(); if(ptrbuf >= lenbuf){ ptrbuf = 0; try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); } if(lenbuf <= 0)return -1; } return inbuf[ptrbuf++]; } private static boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); } private static int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; } private static double nd() { return Double.parseDouble(ns()); } private static char nc() { return (char)skip(); } private static String ns() { int b = skip(); StringBuilder sb = new StringBuilder(); while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ') sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } private static char[] ns(int n) { char[] buf = new char[n]; int b = skip(), p = 0; while(p < n && !(isSpaceChar(b))){ buf[p++] = (char)b; b = readByte(); } return n == p ? buf : Arrays.copyOf(buf, p); } private static char[][] nm(int n, int m) { char[][] map = new char[n][]; for(int i = 0;i < n;i++)map[i] = ns(m); return map; } private static int[] na(int n) { int[] a = new int[n]; for(int i = 0;i < n;i++)a[i] = ni(); return a; } private static int ni() { int num = 0, b; boolean minus = false; while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')); if(b == '-'){ minus = true; b = readByte(); } while(true){ if(b >= '0' && b <= '9'){ num = num * 10 + (b - '0'); }else{ return minus ? -num : num; } b = readByte(); } } private static long nl() { long num = 0; int b; boolean minus = false; while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-')); if(b == '-'){ minus = true; b = readByte(); } while(true){ if(b >= '0' && b <= '9'){ num = num * 10 + (b - '0'); }else{ return minus ? -num : num; } b = readByte(); } } private static void tr(Object... o) { if(INPUT.length() != 0)System.out.println(Arrays.deepToString(o)); } }