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#include<bits/stdc++.h>
using namespace std;
int main()
{
int count = 0;
int time1 = 0;
int time2 = 0;
int time3 = 0;
for(int i = 1;i<=21;i++)
{
time1= i*5;
if(time1%6 == 0 || time1 % 7 ==0) ;
else count++;
}
for(int i = 1;i<=21;i++)
{
time2 = i*6;
if(time2 %7 ==0);
else count++;
}
count+=21;
cout<<count;
return 0;
}
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