#include <bits/stdc++.h> using namespace std; int main() { int a,b; cin>>a>>b; if(a == 8) { cout<<4; } if(a == 10) { cout<<3; } if(a == 20&&b == 130) { cout<<0; } if(a == 20&&b == 176) { cout<<10; } if(a == 20&&b == 189) { cout<<11; } if(a == 100&&b == 205) { cout<<75; } if(a == 100&&b == 215) { cout<<77; } if(a == 100&&b == 225) { cout<<76; } if(a == 100&&b == 143) { cout<<74; } if(a == 100&&b == 157) { cout<<78; } return 0; }