#include<stdio.h>
int main() {
int n, m;
int i, j, count = 0;
float xs ;
int a[10][10] = {0}, b[10][10] = {0};
scanf("%d %d", &n, &m);
for (i = 0; i < n; i++) {
for (j = 0; j < m; j++) {
scanf("%d ", &a[i][j]);
}
}
for (i = 0; i < n; i++) {
for (j = 0; j < m; j++) {
scanf("%d ", &b[i][j]);
if (a[i][j] == b[i][j])
count++;
}
}
xs = 100.0*count / (m * n);
printf("%.2f\n", xs);
}