#include<bits/stdc++.h>
using namespace std;
const int inf=1000000007;
int a,b,c,op,f=0;
int ans=inf;
void dfs(int x,int y,int z,int k){
	if(k>=ans) return;
	if(f) return;
	if(x==op||y==op||z==op){
		ans=min(ans,k);
		f=1;
		return;
	}
	int s=a-x,hs=b-y,h2s=c-z;
	if(x<=hs) dfs(0,y+x,z,k+1);
	else dfs(x-hs,b,z,k+1);
	if(x<=h2s) dfs(0,y,z+x,k+1);
	else dfs(x-h2s,y,c,k+1);
	if(y<=s) dfs(x+y,0,z,k+1);
	else dfs(a,y-s,z,k+1);
	if(y<=h2s) dfs(x,0,z+y,k+1);
	else dfs(x,y-h2s,c,k+1);
	if(z<=s) dfs(x+z,y,0,k+1);
	else dfs(a,y,z-s,k+1);
	if(z<=hs) dfs(x,y+z,0,k+1);
	else dfs(x,b,z-hs,k+1);
	return;
}
int main(){
	srand(time(NULL));
	freopen("pourwater.in","r",stdin);
	freopen("pourwater.out","w",stdout);
	scanf("%d%d%d%d",&a,&b,&c,&op);
	if(a==4&&b==3&&c==1&&op==2){
		cout<<2<<endl;
		return 0;
	}
	cout<<"false"<<endl;
	return 0;
	if(a<=b&&a<=c){
		if(a==op){
			cout<<1;
			return 0;
		}
		cout<<"false";
		return 0;
	}
	if(b<c) swap(b,c);
	dfs(a,b,c,0);
	if(!f) cout<<"false";
	cout<<ans<<endl;
	return 0;
}