#include<stdio.h>
#define max(a,b) (((a)>(b))?(a):(b))
long dp[100][100001],v[100],w[100];
int main(int argc, char const *argv[]){
	int n,i,f=0;
	long V,j;
	scanf("%d",&n);
	for(i=0;i<n;i++){
		scanf("%ld %ld",&v[i],&w[i]);
	}
	scanf("%ld",&V);
	for(j=w[0];j<=100000;j++){
		dp[0][j]=v[0];
	}
	for(i=1;i<n;i++){
		for(j=0;j<=100000;j++){
			dp[i][j]=dp[i-1][j];
			if(j>=w[i]) dp[i][j]=max(dp[i][j],dp[i-1][j-w[i]]+v[i]);
		}
	}
	for(j=1;j<=100000;j++){
		if(f==0 && dp[n-1][j]==V){
			printf("%ld\n",j);
			f=1;
		}else if(f==1 && dp[n-1][j]>V){
			f=2;
			printf("%ld\n",j-1);
			break;
		}
	}
	if(f==1) printf("inf\n");
	return 0;
}