zoj 2256 Mincost

#include <stdio.h>int main(){ int n ; while(scanf("%d",&n) !=EOF) { if( n == 0) break; if( n<= 4 ) { printf("10n") ; continue; } double sum ; double s ; int t = n /8 ; sum =(double) t * 18 ; int k = n % 8 ; if( k <= 4 ) s = 10 ; else s= 10 + ( k-4) * 2 ; if(k < 5 && t ) s = k * 1.0 * 2.4 ; sum += s ; k = int(sum) ; if( sum - k <= 0.000000 ) printf("%.0lfn",sum ) ; else printf("%.1lfn",sum ) ; } return 0 ;}