poj-2304

• turn the dial clockwise 2 full turns 
• stop at the first number of the combination 
• turn the dial counter-clockwise 1 full turn 
• continue turning counter-clockwise until the 2nd number is reached 
• turn the dial clockwise again until the 3rd number is reached 
• pull the shank and the lock will open.

#include<stdio.h>int main(){int n,first,midle,last,sum,t;while(scanf("%d%d%d%d",&n,&first,&midle,&last)){if(n==0 && first==0 && midle==0 && last==0)break;sum=1080;t=n-first;if(t<0)t+=40;sum+=t*9;t=midle-first;if(t<0)t+=40;sum+=t*9;t=midle-last;if(t<0)t+=40;sum+=t*9;printf("%d\n",sum);}return 0;}