#include <stdio.h>
#include <string.h>
#include <ctype.h>
char s[1001];
int stack[1001];
int main(){
    int stacktop = -1;
    while(fgets(s, 1000,stdin)){
        int len = strlen(s),ans = 0,i;
        char *start = s,*end = s;
        for(i = 0;i < 2;++i){//拿到前两个数字进栈
            int tmp = 0;
            while(isdigit(*end))    tmp *= 10,tmp += (*end - '0') ,end++;
            stack[++stacktop] = tmp,end++,start = end;
        }
        while(stacktop != -1){
            if(isdigit(*start)){
                int tmp = 0;
                while(isdigit(*end))    tmp *= 10,tmp += (*end - '0') ,end++;
                stack[++stacktop] = tmp,end++,start = end;
            }
            else if(*start == '+'){
                stack[stacktop - 1] += stack[stacktop];
                --stacktop,start++,end = start;
            }
            else if(*start == '-'){
                stack[stacktop - 1] -= stack[stacktop];
                --stacktop,start++,end = start;
            }
            else if(*start == '*'){
                stack[stacktop - 1] *= stack[stacktop];
                --stacktop,start++,end = start;
            }
            else if(*start == '/'){
                stack[stacktop - 1] /= stack[stacktop];
                --stacktop,start++,end = start;
            }
            else if(*start == '@'){
                ans = stack[stacktop--];
                break;
            }
        }
        printf("%d\n",ans);
    }
    return 0;
}