include <stdio.h>

int main() {

int a[70][70], d[70][70];
int m, n, x = 0, i, j;
scanf("%d%d", &n, &m);
for (i = 1; i <= n; i++) {
	for (j = 1; j <= m; j++) {
		scanf("%d", &a[i][j]);
	}
}
for (i = 1; i <= n; i++) {
	for (j = 1; j <= m; j++) {
		scanf("%d", &d[i][j]);
	}
}
for (i = 1; i <= n; i++) {
	for (j = 1; j <= m; j++) {
		if (a[i][j] == d[i][j]) {
			x++;
		}
	}
}
printf("%d", x);
return 0;

}