#include <bits/stdc++.h>

using namespace std;
int top, buttom;
int main(){
	//freopen(".in", "r", stdin);
	//freopen(".out", "w", stdout);
	string a;
	cin >> a;
	int Stack[10005] = {};
	for(int i = 0; i < a.length(); i++) {
		if(a[i] >= '0' && a[i] <= '9' && (i == 0 || a[i - 1] == '.')) {
			int c = 0, k = i;
			while(1) {
				if(a[k] == '.') {
					break;
				}else{
					int x = a[k] - '0';
					c = c * 10 + x;
					k++;
				}
			}
			Stack[top] = c;
			top++;
		}
		if(a[i] < '0' || a[i] > '9') {
			char x = a[i];
			if(x == '-') {
				int w = Stack[top - 2] - Stack[top - 1];
				top = top - 2;
				Stack[top] = w;
				top++;
			}
			if(x == '+') {
				int w = Stack[top - 2] + Stack[top - 1];
				top = top - 2;
				Stack[top] = w;
				top++;
			}
			if(x == '*') {
				int w = Stack[top - 2] * Stack[top - 1];
				top = top - 2;
				Stack[top] = w;
				top++;
			}
			if(x == '/') {
				int w = Stack[top - 2] / Stack[top - 1];
				top = top - 2;
				Stack[top] = w;
				top++;
			}
			if(x == '@') {
				cout << Stack[top - 1];
			}
		}
		
	}
    return 0;
}