#include "iostream"
#include "climits"
#include "list"
#include "queue"
#include "stack"
#include "set"
#include "functional"
#include "algorithm"
#include "math.h"
#include "utility"
#include "string"
#include "map"
#include "unordered_map"
#include "iomanip"
#include "random"

using namespace std;
const long long int MOD = 1000000007;
list<long long int> Prime(int M) {
	list<long long int>P;
	P.push_back(2);
	P.push_back(3);
	for (int i = 5; i <= M; i += 6) {
		bool flag = true;
		for (auto j : P) {
			if (i%j == 0) {
				flag = false;
				break;
			}
		}
		if (flag)P.push_back(i);
		flag = true;
		for (auto j : P) {
			if ((i + 2) % j == 0) {
				flag = false;
				break;
			}
		}
		if (flag)P.push_back(i + 2);
	}
	return P;
}

long long int N, K, Q;

int dp[100001];
int w[100001];
int v[100001];
int V;

int main() {
	ios::sync_with_stdio(false);
	cin >> N;
	for (int i = 0; i < N; i++)cin >> v[i] >> w[i];
	cin >> V;
	for (int i = 0; i < N; i++) {
		for (int j = 100000; j >= w[i]; j--) {
			dp[j] = max(dp[j], dp[j - w[i]] + v[i]);
		}
	}
	for (int i = 1; i <= 100000; i++) {
		//cout << dp[i] << endl;
		if (dp[i] == V) {
			cout << i << endl;
			break;
		}
	}
	if (dp[N * 1000] == V) {
		cout << "inf\n";
		return 0;
	}
	for (int i = 1000*N; i>= 0; i--) {
		if (dp[i] == V) {
			cout << i << endl;
			break;
		}
	}
	return 0;
}