#3WA求调 QwQ

/* La Vaguelette */
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long

char a[100005], b[100005];
int ai, bi;

int main()
{
#ifdef LOCAL
    freopen("./in.txt", "rb", stdin);
    freopen("./out.txt", "wb", stdout);
#endif
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    string x;
    while (1)
    {
        getline(cin, x);
        if (x == "EOF")
            break;
        int n = x.length();
        for (int i = 0; i < n; ++i)
        {
            if (x[i] == '<')
            {
                if (ai != 0 && a[ai - 1] != '\n')
                    a[--ai] = 0;
            }
            else
                a[ai++] = x[i];
        }
        a[ai++] = '\n';
    }
    while (1)
    {
        getline(cin, x);
        if (x == "EOF")
            break;
        int n = x.length();
        for (int i = 0; i < n; ++i)
        {
            if (x[i] == '<')
            {
                if (bi != 0 && b[bi - 1] != '\n')
                    b[--bi] = 0;
            }
            else
                b[bi++] = x[i];
        }
        b[bi++] = '\n';
    }
    int cnt = 0, t;
    cin >> t;
    for (ai = 0, bi = 0; a[ai] && b[bi]; ++ai, ++bi)
    {
        while (a[ai] == '\n' && b[bi] != '\n')
            ++bi;
        while (a[ai] != '\n' && b[bi] == '\n')
            ++ai;
        if (a[ai] == '\n')
        {
            ++ai;
            ++bi;
        }
        if (a[ai] && a[ai] != '\n' && a[ai] == b[bi])
            ++cnt;
    }
    printf("%.0f\n", cnt * 60.0 / t);
    return 0;
}