#include <iostream>
using namespace std;
int main() {
// your code goes here
int i,n,j,x,y,z,m,cnt=0;
cin>>x>>y>>z>>n>>m;
for(i=1;i<=n/x+1;i++){
for(j=1;j<=n/y+1;j++){
if(j*y+i*x<=n&&(j*y)+(i*x)+((m-x-y)*(1.0/z))<=m) cnt++;
}
}
cout<<cnt<<"\n";
return 0;
}
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