#include <iostream>
#include <iomanip>
using namespace std;

int main() {
    int n, m;
    // 读取矩阵尺寸
    if (!(cin >> n >> m)) {
        cerr << "输入错误：无法读取矩阵尺寸" << endl;
        return 1;
    }
    
    // 检查尺寸范围
    if (n < 1 || n > 100 || m < 1 || m > 100) {
        cerr << "输入错误：矩阵尺寸超出范围" << endl;
        return 1;
    }
    
    // 动态分配并读取第一幅图像
    int** image1 = new int*[n];
    for (int i = 0; i < n; ++i) {
        image1[i] = new int[m];
        for (int j = 0; j < m; ++j) {
            if (!(cin >> image1[i][j])) {
                cerr << "输入错误：无法读取图像数据" << endl;
                return 1;
            }
            // 检查像素值范围
            if (image1[i][j] != 0 && image1[i][j] != 1) {
                cerr << "输入错误：像素值必须为0或1" << endl;
                return 1;
            }
        }
    }
    
    // 读取并比较第二幅图像
    int same_count = 0;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            int pixel2;
            if (!(cin >> pixel2)) {
                cerr << "输入错误：无法读取第二幅图像数据" << endl;
                return 1;
            }
            if (image1[i][j] == pixel2) {
                same_count++;
            }
        }
    }
    
    // 释放内存
    for (int i = 0; i < n; ++i) {
        delete[] image1[i];
    }
    delete[] image1;
    
    // 计算相似度
    double similarity = (double)same_count / (n * m) * 100.0;
    
    // 输出结果，保留两位小数
    cout << fixed << setprecision(2) << similarity << endl;
    
    return 0;
}

/**************************************************************
	Problem: 1998
	User: fuyijun
	Language: C++
	Result: Wrong Answer
****************************************************************/