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#include <stdio.h>

long factorial(int n) {

long result = 1;

for (int i = 1; i <= n; ++i)

result *= i;

return result;

}

int main ()

{

double n=0;

int i;

for (i=0; i<=32; i++) {

n=(1.0/factorial(i))+n;

}

printf("%.32f\n", n);

}

//2.71828182845904553488480814849027

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