enum{M=1500};
N,A[M],B[M],h,i,j,k,x[M],y[M],s,t;
main(z){
	scanf("%d",&N);
	for(i=N;i--;)scanf("%d",A+i);
	for(i=N;i--;)scanf("%d",B+i);
	for(z=h=N;h--;){
		for(i=N;i--;)x[i]=A[i]<<11;
		for(k=N;k--;){
			for(i=N;i--;)if(x[j]>x[i])j=i;
			x[j]+=B[(h+k)%N]/2<<11|1;
		}
		for(t=0,i=N;i--;t<s&&(t=s))s=x[i]&2047;
		if(z>t)z=t;
	}
	printf("%d",z);
}