#include <stdio.h>

int main() {
    float m,n=0;
    scanf("%f %f",&m,&n);
    int i=0;
    float arr1[100]={0};
     float arr2[100]={0};
     float count=0;
    for(i=0;i<m*n;i++)
     scanf("%f",&arr1[i]);
      for(i=0;i<m*n;i++)
     scanf("%f",&arr2[i]);
     for(i=0;i<m*n;i++)
     {if(arr1[i]==arr2[i])
       count++;

}
printf("%.2f",count/(m*n)*100);
    
     
    return 0;
}