#include <bits/stdc++.h>
#define W 100000
typedef long long ll;
using namespace std;

int N, V;
vector<int> value(101, 0);
vector<int> weight(101, 0);
vector<int> dp(100001, 0);
//dp[i]に「重さi以内で得られる価値の最大値」

int main(void){
    
    cin >> N;
    for(int i = 0; i < N; ++i) cin >> value[i] >> weight[i];
    cin >> V;
    
    for(int j = 0; j < N; ++j){
        for(int i = W; i >= weight[j]; --i) dp[i] = max(dp[i], dp[i - weight[j]] + value[j]);
    }
    
    int i, num;
    for(i = 1; i <= W; ++i){
        if(dp[i] >= V){
            cout << (num = i) << endl;
            break;
        }
    }
    for(; i <= W; ++i){
        if(dp[i] > dp[num]){
            cout << i - 1 << endl;
            return 0;
        }
    }
    cout << "inf" << endl;
    
    return 0;
}