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//
#ifndef __SIZEOF_INT128__
  #define __SIZEOF_INT128__
#endif
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace chrono;
using namespace __gnu_pbds;
template <typename T> using oset =  tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define rep(i, p, k) for(int i(p); i < (k); ++i)
#define per(i, p, k) for(int i(p); i > (k); --i)
#define sz(x) (int)(x).size()
#define sc static_cast
typedef long long ll;
typedef long double ld;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef __int128_t lll;
//#define int ll
template <typename T = int> using par = std::pair <T, T>;
#define fi first
#define se second
#define test int _number_of_tests(in()); while(_number_of_tests--)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define pb emplace_back
struct Timer {
    string name{""};
    time_point<high_resolution_clock> end, start{high_resolution_clock::now()};
    duration<float, std::milli> dur;
    Timer() = default;
    Timer(string nm): name(nm) {}
    ~Timer() {
        end = high_resolution_clock::now(); dur= end - start;
        cout << "@" << name << "> " << dur.count() << " ms" << '\n';
    }
};
template <typename T = int> inline T in()
{
    static T x;
    std::cin >> x;
    return x;
}
std::string yn(bool b)
{
    if(b) return "YES\n";
    else return "NO\n";
}
template <typename F, typename S> std::ostream& operator<<(std::ostream& out, const std::pair <F, S>& par);
template <typename T> std::ostream& operator<< (std::ostream& out, const std::vector <T>& wek)
{
    for(const auto& i : wek)out << i << ' ';
    return out;
}
template <typename F, typename S> std::ostream& operator<<(std::ostream& out, const std::pair <F, S>& par)
{
    out << '{'<<par.first<<", "<<par.second<<"}";
    return out;
}
#define show(x) cerr << #x << " = " << x << '\n';
constexpr int MAXN = 2e5 + 3;
set <pair <int, int>> graf[MAXN];
void add(int a, int b, int c){
    graf[a].insert(par<int>{b, c});
    graf[b].insert(par<int>{a, c});
}
void rem(int a, int b){
    graf[a].erase(graf[a].lower_bound(par<int>{b, 0}));
    graf[b].erase(graf[b].lower_bound(par<int>{a, 0}));
}
int kol[MAXN];
void dfs(int w, ll d, int k, int o = 0)
{
    if(d < 0)return;
    kol[w] = k;
    for(auto [i, j]: graf[w])if(i != o)dfs(i, d-j, k, w);
}
std::int32_t main()
{
    std::cout.tie(nullptr); //for luck
    std::cin.tie(nullptr); std::ios_base::sync_with_stdio(0);
    int n(in()), m(in()), q(in());
    rep(i, 0, m){
        int a(in()), b(in()), c(in());
        add(a, b, c);
    }
    rep(i, 0, q){
        int t(in());
        if(t == 1){
            int a(in()), b(in()), c(in());
            add(a, b, c);
        }
        if(t == 2){
            int a(in()), b(in());
            rem(a, b);
        }
        if(t == 3){
            int w, k;
            ll d;
            cin >> w >> d >> k;
            dfs(w, d, k);
        }
        if(t == 4)cout << kol[in()] << '\n';
    }
    return 0;
}