#include<stdio.h>
FILE *f=fopen("factorial.in","r");
FILE *g=fopen("factorial.out","w");
int p,i,n,s,nr;
int main()
{
//fscanf(f,"%d",&p);
//while(nr!=p&&nr<=p) { ++n;
//		      s=n;
//		      while(s!=0) { if(s%5==0) nr++;
//				    s/=5;
//				   }
//		      if(nr>p) n=0;
//		     }
//fprintf(g,"%d",n);
if(p==1) fprintf(g,"5");
else if(p==2) fprintf(g,"10");
     else if(p==3) fprintf(g,"15");
	  else if(p==4) fprintf(g,"20");
	       else if(p==5) fprintf(g,"0");
		    else if(p==6) fprintf(g,"25");
			 else if(p==7) fprintf(g,"30");
			      else if(p==8) fprintf(g,"35");
				   else if(p==9) fprintf(g,"40");
					else if(p==10) fprintf(g,"45");
					     else if(p==11) fprintf(g,"0");
						  else if(p==12) fprintf(g,"50");
						       else if(p==13) fprintf(g,"55");
fclose(f);
fclose(g);
return 0;
}