#include <stdio.h>
#include <string.h>

int main(int argc, const char * argv[]) {
  char string[101], operator = '\0';
  int i, accumulator, number;
  
  accumulator = number = 0;
  scanf("%s", string);
  for (i = 0; i <= strlen(string); i++) {
    if (string[i] < '0' || string[i] > '9') {
      switch (operator) {
        case '*':
          accumulator += number;
          break;
        case '+':
          accumulator *= number;
          break;
        case '\0':
          accumulator = number;
          break;
      }
      operator = string[i];
      number = 0;
    }
    else {
      number = number * 10 + (int)(string[i] - '0');
    }
  }
  printf("%d\n", accumulator);

  return 0;
}