#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
    int A1,a1,A2,a2,A3,a3;
    cin>>A1>>A2>>A3;
    int c=0;
    for(int p=1;p<=1001;p++){
        a1=A1%p; a2=A2%p; a3=A3%p;
        if(a1>a2&&a2<a3||a1<a2&&a2>a3){
            c++;
            if(p==1001){
                cout<<"INF"<<endl;
                return 0;
            }
        }
    }
    cout<<c<<endl;
    return 0;
}