ACM 10916 - Factstone Benchmark

#include <stdio.h>
#include <math.h>

int main()
{
    double bit2, fac;
    int n, i, y;
    while (scanf("%d", &n) == 1 && n)
    {
        y = ((n - 1960) / 10);
        bit2 = 4;
        
        while(y --)
            bit2 *= 2;
        bit2 = bit2 * log(2.0);
        double j = 1;
        fac = 0;
        for (i = 1; fac < bit2; i ++)
            fac += log(i);
        printf("%d\n", i - 2);    
    }
    return 0;
}

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