#include<bits/stdc++.h>
#include<vector>
using namespace std;

int main(){
    int n,m;
    vector<int>a;
    int q=0,sig=1;
    cin>>n>>m;
    if(n<0){
        n=-n;
        sig-=2;
    }
    while(n--){
        a.push_back(m);
    }
    vector<int>::iterator it;
    for(it=a.begin();it!=a.end();it++)q+=*it;
    q*=sig;
    cout<<"PROD = "<<q<<endl;
}

vector法