#include <bits/stdc++.h>
#define int long long
#define vi vector<int>
#define endl "\n"
#define invec(name, n) for(int abc = 0; abc < n; abc++) cin >> name[abc];
#define outvec(name, n) for(int abc = 0; abc < n; abc++) cout << name[abc] << " ";
#define format_decimal(x) fixed << setprecision(x)
using namespace std;
void solve()
{
int n; cin >> n;
vi h(n), t(n); invec(h, n); invec(t, n);
bool found = false;
int ctr = 0;
int ans = 0;
for(int i = 0; i < n; i++)
{
if(h[i] == t[i]) found = true;
if(h[i] <= t[i]) ctr++;
else
{
if(found) ans += ctr;
found = false;
ctr = 0;
}
}
if(found) ans += ctr;
found = false;
ctr = 0;
cout << ans;
cout << endl;
}
signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int t = 1;
//cin >> t;
for(int i = 1; i <= t; i++) solve();
return 0;
}
