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http://betaver.blogbus.com/logs/1299140.html

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

int main()
{
    int h,u,d,f;
    int day;
    float height,up,updown;
    while (1)
    {
          scanf("%d%d%d%d",&h,&u,&d,&f);
          day=1;height=0;up=u;
          updown=up*(float)f/100;
          if (h==0) exit(0);
          while (1)
          {
                height+=up;
                if (height>h) {printf("success on day %d\n",day);break;}
                height-=d;
                if (height<0) {printf("failure on day %d\n",day);break;}               
                day++;
                up-=updown;
                if (up<=0) up=0;
          }
    }
}