#include <cstdio>
#include <cmath>
#include <cstring>
#include <cstdlib>
#include <climits>
#include <ctime>
#include <queue>
#include <stack>
#include <algorithm>
#include <list>
#include <vector>
#include <set>
#include <map>
#include <iostream>
#include <deque>
#include <complex>
#include <string>
#include <iomanip>
#include <sstream>
#include <bitset>
#include <valarray>
#include <unordered_map>
#include <iterator>
#include <functional>
#include <cassert>
using namespace std;
typedef long long int ll;
typedef unsigned int uint;
typedef unsigned char uchar;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;

#define REP(i,x) for(int i=0;i<(int)(x);i++)
#define REPS(i,x) for(int i=1;i<=(int)(x);i++)
#define RREP(i,x) for(int i=((int)(x)-1);i>=0;i--)
#define RREPS(i,x) for(int i=((int)(x));i>0;i--)
#define FOR(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();i++)
#define RFOR(i,c) for(__typeof((c).rbegin())i=(c).rbegin();i!=(c).rend();i++)
#define ALL(container) (container).begin(), (container).end()
#define RALL(container) (container).rbegin(), (container).rend()
#define SZ(container) ((int)container.size())
#define mp(a,b) make_pair(a, b)
#define pb push_back
#define eb emplace_back
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );

template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
template<class T> ostream& operator<<(ostream &os, const vector<T> &t) {
os<<"["; FOR(it,t) {if(it!=t.begin()) os<<","; os<<*it;} os<<"]"; return os;
}
template<class T> ostream& operator<<(ostream &os, const set<T> &t) {
os<<"{"; FOR(it,t) {if(it!=t.begin()) os<<","; os<<*it;} os<<"}"; return os;
}
template<class S, class T> ostream& operator<<(ostream &os, const pair<S,T> &t) { return os<<"("<<t.first<<","<<t.second<<")";}
template<class S, class T> pair<S,T> operator+(const pair<S,T> &s, const pair<S,T> &t){ return pair<S,T>(s.first+t.first, s.second+t.second);}
template<class S, class T> pair<S,T> operator-(const pair<S,T> &s, const pair<S,T> &t){ return pair<S,T>(s.first-t.first, s.second-t.second);}

const int INF = 1<<28;
const double EPS = 1e-8;
const int MOD = 1000000007;

struct UnionFind {
  vector<int> d;
  UnionFind(int n=0) : d(n, -1){}
  bool unite(int x, int y) {
    if ((x = root(x)) != (y = root(y))){
      if (d[y] < d[x]) swap(x, y);
      d[x] += d[y]; d[y] = x;
    }
    return x != y;
  }
  bool find(int x, int y){return root(x) == root(y);}
  int root(int x){return d[x] < 0 ? x : d[x] = root(d[x]);}
  int size(int x=-1) {return x<0 ? d.size() : -d[root(x)];}
};

int n, m;

int main(int argc, char *argv[]){
	ios::sync_with_stdio(false);
	cin >> n;
	vi V(n);
	map<string, int> stoi;
	REP(i, n){
		string s;
		int v;
		cin >> s >> v;
		stoi[s] = i;
		V[i] = v;
	}
	UnionFind uf(n);
	cin >> m;
	REP(i, m){
		string s, t;
		cin >> s >> t;
		uf.unite(stoi[s], stoi[t]);
	}
	ll ans = 0;
	REP(i, n)if(uf.root(i) == i){
		int mi = INF;
		REP(j, n)if(uf.root(j) == i) mi = min(mi, V[j]);
		ans += mi * uf.size(i);
	}
	cout << ans << endl;
	return 0;
}