#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(){ int n,m,sum=0,a[101][101]={0},b[101][101]={0}; cin>>n>>m; double s; 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++; } } } s=sum*100.0/(n*m); printf("%.2lf\n",s); return 0; }