import java.io.*; import java.util.*; public class Main_yukicoder697 { private static Scanner sc; private static Printer pr; private static void solve() { // 4近傍 int[] dx = { 1, 0, -1, 0 }; int[] dy = { 0, 1, 0, -1 }; int h = sc.nextInt(); int w = sc.nextInt(); BitSet a = new BitSet(h * w); for (int i = 0; i < h; i++) { char[] tmp = sc.nextLine().toCharArray(); for (int j = 0; j < w; j++) { if (tmp[j * 2] == '1') { a.set(i * w + j); } } } int cnt = 0; BitSet used = new BitSet(h * w); Deque st = new ArrayDeque<>(h * w); for (int i = 0; i < h; i++) { for (int j = 0; j < w; j++) { int index = i * w + j; if (!used.get(index) && a.get(index)) { cnt++; used.set(index); st.clear(); st.push(i * 10000 + j); while (!st.isEmpty()) { int e = st.pop(); int x = e % 10000; int y = e / 10000; for (int k = 0; k < 4; k++) { int nextx = x + dx[k]; int nexty = y + dy[k]; int nindex = nexty * w + nextx; if (nextx < 0 || nextx >= w || nexty < 0 || nexty >= h) { continue; } if (used.get(nindex) || !a.get(nindex)) { continue; } used.set(nindex); st.push(nexty * 10000 + nextx); } } } } } pr.println(cnt); } static class Pair implements Comparable { int a; int b; Pair(int a, int b) { this.a = a; this.b = b; } @Override public int compareTo(Pair o) { if (a == o.a) { return Integer.compare(b, o.b); } return Integer.compare(a, o.a); } @Override public int hashCode() { return Integer.hashCode(a + b); } @Override public boolean equals(Object obj) { Pair o = (Pair) obj; return a == o.a && b == o.b; } @Override public String toString() { // [xxx, xxxx] StringBuilder stmp = new StringBuilder(32); stmp.append('['); stmp.append(a); stmp.append(','); stmp.append(' '); stmp.append(b); stmp.append(']'); return stmp.toString(); } } // --------------------------------------------------- public static void main(String[] args) { sc = new Scanner(INPUT == null ? System.in : new ByteArrayInputStream(INPUT.getBytes())); pr = new Printer(System.out); solve(); // pr.close(); pr.flush(); // sc.close(); } static String INPUT = null; @SuppressWarnings("unused") private static class Scanner { BufferedReader br; Scanner (InputStream in) { br = new BufferedReader(new InputStreamReader(in)); } private boolean isPrintable(int ch) { return ch >= '!' && ch <= '~'; } private boolean isCRLF(int ch) { return ch == '\n' || ch == '\r' || ch == -1; } private int nextPrintable() { try { int ch; while (!isPrintable(ch = br.read())) { if (ch == -1) { throw new NoSuchElementException(); } } return ch; } catch (IOException e) { throw new NoSuchElementException(); } } String next() { try { int ch = nextPrintable(); StringBuilder sb = new StringBuilder(); do { sb.appendCodePoint(ch); } while (isPrintable(ch = br.read())); return sb.toString(); } catch (IOException e) { throw new NoSuchElementException(); } } int nextInt() { try { // parseInt from Integer.parseInt() boolean negative = false; int res = 0; int limit = -Integer.MAX_VALUE; int radix = 10; int fc = nextPrintable(); if (fc < '0') { if (fc == '-') { negative = true; limit = Integer.MIN_VALUE; } else if (fc != '+') { throw new NumberFormatException(); } fc = br.read(); } int multmin = limit / radix; int ch = fc; do { int digit = ch - '0'; if (digit < 0 || digit >= radix) { throw new NumberFormatException(); } if (res < multmin) { throw new NumberFormatException(); } res *= radix; if (res < limit + digit) { throw new NumberFormatException(); } res -= digit; } while (isPrintable(ch = br.read())); return negative ? res : -res; } catch (IOException e) { throw new NoSuchElementException(); } } long nextLong() { try { // parseLong from Long.parseLong() boolean negative = false; long res = 0; long limit = -Long.MAX_VALUE; int radix = 10; int fc = nextPrintable(); if (fc < '0') { if (fc == '-') { negative = true; limit = Long.MIN_VALUE; } else if (fc != '+') { throw new NumberFormatException(); } fc = br.read(); } long multmin = limit / radix; int ch = fc; do { int digit = ch - '0'; if (digit < 0 || digit >= radix) { throw new NumberFormatException(); } if (res < multmin) { throw new NumberFormatException(); } res *= radix; if (res < limit + digit) { throw new NumberFormatException(); } res -= digit; } while (isPrintable(ch = br.read())); return negative ? res : -res; } catch (IOException e) { throw new NoSuchElementException(); } } float nextFloat() { return Float.parseFloat(next()); } double nextDouble() { return Double.parseDouble(next()); } String nextLine() { try { int ch; while (isCRLF(ch = br.read())) { if (ch == -1) { throw new NoSuchElementException(); } } StringBuilder sb = new StringBuilder(); do { sb.appendCodePoint(ch); } while (!isCRLF(ch = br.read())); return sb.toString(); } catch (IOException e) { throw new NoSuchElementException(); } } void close() { try { br.close(); } catch (IOException e) { // throw new NoSuchElementException(); } } } private static class Printer extends PrintWriter { Printer(OutputStream out) { super(out); } } }