#include <stdio.h>
int main(void) {
int a,s;
a=1;
s=0;
while(a<=100)
{switch(a%3)
{case 0:
s=s;
case 1:
case 2:
if(a%10>=6)
s=s+a;
else
s=s;
}
a=a+1;
}
return 0;
}
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