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#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF 1145141919810364364
#define REP(i,n) for (int i=0;i<(n);i++)
typedef pair<int,int> P;
signed main() {
double PI=3.141592653589793;
int A,B,C;
double tmp1=0,tmp2=10000.0;
for(int i=0;i<100000;i++){
double tmp=(tmp2+tmp1)/2.0;
double x=A*tmp+B*sin(C*tmp*PI);
if(x>100.0) tmp2=tmp;
else tmp1=tmp;
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