#include <stdio.h>
#include <stdlib.h>
char scanpolyaka(void) {
    char y;
    do {
        scanf("%c", &y);
    } while (y == ' ');
    if (y != '/' && y != '*') {
        char num;
        int x = 1;
        if (y == '-') {
            x = -1;
            scanf("%c", &y);
        }
        while (1) {
            scanf("%c", &num);
            if (num == ' ') break;
            y += num;
        }
        y *= x;
    }
    return y;
}
int polyak(char x) {
    char y, z;
        if (x == '/') {
        y = scanpolyaka();
        z = scanpolyaka();
        return polyak(y) / polyak(z);
    } else if (x == '*') {
        y = scanpolyaka();
        z = scanpolyaka();
        return polyak(y) * polyak(z);
    } else {
        return x;
    }
}
int main()
{
    printf("%c", polyak(scanpolyaka()));
    return 0;
}