50196. Secret Expression

#include <stdio.h>
#include <stdlib.h>
 
int main(){
    int total_num = 0, last_num = 0;
    int op = 8, next_op;
    while(1){
        int now_num = 0, d;
        while(scanf("%d", &d) != EOF){
            if(d == 0 || d == 8 || d == 9){
                next_op = d;
                break;
            }
            else{
                now_num = now_num * 10 + d;
            }
        }
        if(op == 8){
            total_num += last_num;
            last_num = now_num;
        }
        if(op == 9){
            last_num *= now_num;
        }
 
        op = next_op;
        if(op == 0) break;
    }
    total_num += last_num;
    printf("%d\n", total_num);
}