// Online C++ Compiler - Build, Compile and Run your C++ programs online in your favorite browser
#include<iostream>
#include <cmath>
using namespace std;
int main()
{
long long int a,b,c,t=0;
string d[5];
cin>>a>>b>>c;
if(a+b==c){
d[t]="+";
t++;
}if(a-b==c){
d[t]="-";
t++;
}if(a*b==c){
d[t]="*";
t++;
}if(b!=0&&a/b==c){
d[t]="/";
t++;
}if((long long)pow(a,b)==c){
d[t]="**";
t++;
}for(int i=0;i<t;i++){
if(i<t-1){
cout<<d[i]<<endl;}
else{
cout<<d[i];
}
}
return 0;
}