PKU 2521. How much did the businessman lose. AC

#include <stdio.h> main() { int n, m, p, c; while(scanf("%d %d %d %d",&n,&m,&p,&c)) { if(n+m+c+p==0) break; printf("%d\n",n-m+p); } }

흠.....

똑같네요 ㅇㅅㅇ