import std;

void main () {
    int N = readln.chomp.to!int;
    int[] A = readln.split.to!(int[]);
    int[] B = readln.split.to!(int[]);

    enforce(A.length == B.length);

    int ans = 0;
    foreach (i; 0..N) {
        if (A[i] <= B[i]) ans++;
    }

    writeln(ans);
}

void read(T...)(string S, ref T args) {
    auto buf = S.split;
    foreach (i, ref arg; args) {
        arg = buf[i].to!(typeof(arg));
    }
}