#include<bits/stdc++.h>
using namespace std;
int main()
{
double h, u, d, l;
while(cin >> h >> u >> d >> l)
{
if(h == 0)
break;
double c, dis, t, nt;
c = dis = t = nt = 0;
int j = 0, f = 0, k = 1;
while(t <= h && c >= 0)
{
dis = u - ((double)j*u*(l/100));
if(dis >= 0)
t = c + dis;
else
t = c;
if(t > h)
{
break;
}
if(t < 0)
{
f = 1;
break;
}
c = t - d;
if(c < 0)
{
f = 1;
break;
}
k++;
j++;
}
if(f == 1)
cout << "failure on day " << k << endl;
else
cout << "success on day " << k << endl;
}
return 0;
}
using namespace std;
int main()
{
double h, u, d, l;
while(cin >> h >> u >> d >> l)
{
if(h == 0)
break;
double c, dis, t, nt;
c = dis = t = nt = 0;
int j = 0, f = 0, k = 1;
while(t <= h && c >= 0)
{
dis = u - ((double)j*u*(l/100));
if(dis >= 0)
t = c + dis;
else
t = c;
if(t > h)
{
break;
}
if(t < 0)
{
f = 1;
break;
}
c = t - d;
if(c < 0)
{
f = 1;
break;
}
k++;
j++;
}
if(f == 1)
cout << "failure on day " << k << endl;
else
cout << "success on day " << k << endl;
}
return 0;
}
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