#include <stdio.h>
#include <math.h>
#include <stdlib.h>
int main()
{
int number, a, b, c, k;
while (scanf("%d", &number
) != EOF
) {
if (number>99)
{
number=number/10;
number=number/10;
number=number/10;
if (c==a+b)
{
k++;
}
while (number>0)
{
a=b;
b=c;
number=number/10;
if (c==a+b)
{
k++;
}
}
}
}
}
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