#include<iostream>
#include<iomanip>
#include<cstring>
#include<cmath>
using namespace std;
int main(){
long double a,b,c,d,e,f,g;
while(cin>>a>>b>>c>>d){
if(a==0){
break;
}
g=0;
f=0;
e=b*(d/100);
while(1){
f++;
if(b>0){
g=g+b;
}
if(g>a){
cout<<"success on day "<<f<<endl;
break;
}
g=g-c;
if(g<0){
cout<<"failure on day "<<f<<endl;
break;
}
b=b-e;
}
}
system("pause");
return 0;
}
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