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#include<iostream>
#include<iomanip>
using namespace std;
int main()
{int m,n,a[10001],b[10001];cin>>m>>n;for(int i=1;i<=m*n;i++) {cin>>a[i];}for(int i=1;i<=m*n;i++){cin>>b[i];}double per=0;double sum=m*n;for(int i=1;i<=m*n;i++){if(a[i]==b[i]){per=per+1;}}cout<<fixed<<setprecision(2)<<per/sum*100<<endl;return 0;
}
