#include <stdio.h>
int main(void) {
int a=1,b=2,c,i,ans;
for(i=1;i<100000;i++)
{
c = 3 * b + 2 * a;
a = b;
b = c;
if(c >= 100 && c <=1000)
{
ans += 1;
}
else if(c > 1000)
{
break;
}
}
return 0;
}
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