#include<stdio.h>
#include<stdlib.h>
int main(){
    int n;
    scamnf("%d",&n);
    if(n<0){
        printf("Invalid input");
        return 0;
    }
    char expr[100];
    scanf(" %[^\n]",expr);
    int result=0;
    int num=0;
    char op='+';
    for(int i=0;expr[i] != '\0';i++){
        if(expr[i] >= '0' && expr[i] <= '9'){
            num =num*10 +(expr[i] -'0');
        }
        if(expr[i] == '+' || expr[i] == '-' || expr[i] == '*' expr[i] == '/' || expr[i+1] == '\0'){
            if(op == '+')  result +=num;
            else if (op == '-') result-= num;
            else if(op =='*') result *= num;
            else if(op =='/')  result /= num;
            op = expr[i];
            num =0;
        }
    }
    printf("%d",result);
    return 0;
}