#include <cstdio>#include <cstdlib>#include <cmath>#include <algorithm>#include <cstring>using namespace std;const double eps=1e-8;const double pi=acos(-1.0);const double g=980;double c, a, v, f;inline double cal_c(double ang){ return v*cos(ang)*(tan(a)-tan(ang))/g-1/f;}inline double func(double t){ return t/(exp(-f*t)-1)-c;}inline double deriv(double t){ double tmp=exp(-f*t); return (tmp-1+t*f*tmp)/(tmp-1)/(tmp-1);}inline double itsec(double x0, double y0, double k){ return x0-y0/k;}inline double solve(double ang){ c=cal_c(ang); double t=1; double res; while(1) { res=func(t); if(fabs(res)<eps)break; t=itsec(t, res, deriv(t)); } double dis=v*cos(ang)*(1-exp(-f*t))/f; return dis/cos(a);}int main(){ int i, res, aa; double tmp, maxl; while(~scanf("%d%lf%lf", &aa, &v, &f)) { maxl=0; a=aa*pi/180.0; for(i=aa+1; i<90; i++) { tmp=solve(i*pi/180.0); if(tmp>maxl)maxl=tmp, res=i; } printf("%dn", res); } return 0;}
