#include <bits/stdc++.h>
using namespace std;
#define int long long
#define double long double
using vint = vector<int>;
#define faster ios_base::sync_with_stdio(false);cin.tie(0)
#define rep(i,n)    for(int i=0;i<(n);i++)
#define in(i)       int n;cin>>(i)
#define in2(i,j)    int i,j;cin>>(i)>>(j)
#define all(n)      (n).begin(),(n).end()

void solve(){
  in2(r,c);
  int p=r*c;
  vint a(p),b(p);
  rep(i,p)cin>>a[i];
  rep(i,p)cin>>b[i];
  int s1=0,s2=0;
  rep(i,p)s1+=(a[i]==b[i]);
  reverse(all(b));
  rep(i,p)s2+=(a[i]==b[i]);
  int s=max(s1,s2);
  double ans=(double)s/(double)p*100L;
  cout<<(int)ans<<"%\n";
}
signed main(){
  faster;
  //in(t);while(t--)
  solve();
  return 0;
}