#include <bits/stdc++.h>
#define tal2a ios::sync_with_stdio(false); cin.tie(nullptr);
#define lolo long long
const double PI = acos(-1.0);
using namespace std;
int main()
{
int x; cin >> x;
string s; cin >> s;
int cnt = 0;
for (int i = 0; i <s.length(); i++) {
if (s[i] == 'V') {
cnt+=5;
}
else if (s[i] == 'W') {
cnt+=2;
}
else if (s[i] == 'X'&&i+1<s.length()) {
s.erase(i+1,1);
}
else if (s[i] == 'Y'&&i+1<s.length()) {
s.push_back(s[i+1]);
s.erase(i+1,1);
}
else if (s[i] == 'Z'&&i+1<s.length()) {
if (s[i+1]=='V') {
cnt/=5;
s.erase(i+1,1);
}
else if (s[i+1]=='W'&&i+1<s.length()) {
cnt/=2;
s.erase(i+1,1);
}
}
}
cout << cnt;
return 0;
}
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