UVA - 10550 - Combination Lock

#include <stdio.h>

int main()
{ int a,b,c,d,sum;
        while (1) {
            scanf("%d %d %d %d",&a,&b,&c,&d);
            if (a == 0 && b == 0 && c == 0 && d == 0)
                break;
            sum = 1080;
            if(a<b)
                sum+=(40-b+a)*9;
            else
                sum+=(a-b)*9;
            if(b>c)
                sum+=(40-b+c)*9;
            else
                sum+=(c-b)*9;
            if(c<d)
                sum+=(40-d+c)*9;
            else
                sum+=(c-d)*9;
            printf("%d\n",sum);
        }
    return 0;
}