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#include <algorithm>
#include <iostream>
#include <sstream>
#include <string>
#include <string_view>
#include <vector>
using namespace std;
bool state = true;
int trymult(const string_view &s) {
if (s.substr(0, 4) != "mul(")
return 0;
auto t = s.substr(4, s.length()-4);
int x = 0, y = 0;
int i = 0;
for (; i < 3; i++)
if (t[i] >= '0' && t[i] <= '9')
x = (x*10) + t[i]-'0';
else break;
if (i == 0 || t[i] != ',')
return 0;
i++;
int j = 0;
for (; j < 3; j++)
if (t[i+j] >= '0' && t[i+j] <= '9')
y = (y*10) + t[i+j]-'0';
else break;
if (j == 0 || t[j+i] != ')')
return 0;
return x*y;
}
bool trytogglestate(bool current_state, const string_view &s) {
if (s.substr(0, 4) == "do()")
return true;
if (s.substr(0, 7) == "don't()")
return false;
return current_state;
}
int mults(const string &line) {
int result = 0;
for (auto i = line.begin(); i != line.end(); i++) {
string_view s(i, line.end());
state = trytogglestate(state, s);
if (state)
result += trymult(s);
}
return result;
}
int main() {
string line;
int result = 0;
while (cin >> line)
result += mults(line);
cout << result << endl;
return 0;
}
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