#include<bits/stdc++.h> using namespace std; int main() { double V,G,M,N; cin>>V; cin>>G; cin>>M; cin>>N; double a=0,b=0; a=V*0.5; if(G<300) { b=M; } else { b=N; } if(a>b) { printf("%.1lf",b); } else { printf("%.1lf",a); } return 0; }
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