UVA

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int x[4];
    int i;
    float C;
    scanf("%d %d %d %d",&x[0],&x[1],&x[2],&x[3]);
    while(x[0]!=0)
    {
        C=0.0;
        for(i=1; C<=x[0] && C>=0; i++)
        {
            C=C+x[1] - 1.0*((i-1)*x[1]*x[3]/100);
            if(C<x[0] && C>=0)
                C=C-x[2];
        }
        if(C<0)
            printf("failure on day %d\n",i-1);
        else
            printf("success on day %d\n",i-1);

        scanf("%d %d %d %d",&x[0],&x[1],&x[2],&x[3]);
    }
   return 0;
}