#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ long long n,m,sum=0; cin>>n>>m; int a[n][m],b[n][m]; for(int i=1;i<=n;i++){ for(int j=1;j<=m;j++){ cin>>a[i][j]; } } for(int i=1;i<=n;i++){ for(int j=1;j<=m;j++){ cin>>b[i][j]; } } for(int i=1;i<=n;i++){ for(int j=1;j<=n;j++){ if(b[i][j]==a[i][j]){ sum++; } } } printf("%.2lf",sum*100.0/(n*m)); return 0; }