二分

#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N=2e5+10;
int n,m,a[N];
bool check(int l)
{
	int res=0;
	for(int i=1;i<=n;i++)
		res+=min(a[i],l);
	if(res<=m)return 1;
	return 0;
}
signed main()
{
	scanf("%lld%lld",&n,&m);int s=0;
	for(int i=1;i<=n;i++)scanf("%lld",&a[i]),s+=a[i];
	if(s<=m){puts("infinite");return 0;}
	int l=0,r=2e14;
	while(l+1<r)
	{
		int mid=(l+r)/2;
		if(check(mid))l=mid;
		else r=mid;
	}
	printf("%lld\n",l);
	return 0;
}