#include<bits/stdc++.h> using namespace std; int main() { int a[100][100],b[100][100],m,n,sum=0; cin>>n>>m; for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) { cin>>a[i][j]; cin>>b[i][j]; if(a[i][j]==b[i][j]) sum+=1; } printf("%.2f",sum*1.0/(m*n)*100); return 0; }