// verifast_options{disable_overflow_check target:ILP32}
extern void abort(void);
//@ requires true;
//@ ensures true;
void reach_error()
//@ requires false;
//@ ensures true;
{}extern short __VERIFIER_nondet_short(void);
//@ requires true;
//@ ensures true;
void assume_abort_if_not(int cond) 
//@ requires true;
//@ ensures true;
{  if(!cond) {abort();}
}
void __VERIFIER_assert(int cond) 
//@ requires (1 <= cond);
//@ ensures (1 <= cond);
{    if (!(cond)) {
    ERROR:
        {reach_error();}
    }
    return;
}

int main() 
//@ requires module(ps3_ll_valuebound20__verifast_instrumented, true);
//@ ensures junk();
{
    //@ open_module(); 
    short k; 
    long long y, x, c;
    k = __VERIFIER_nondet_short();
    assume_abort_if_not(k>=0 && k<=20);

    y = 0;
    x = 0;
    c = 0;

while (1)
//@ invariant ((((3 * (y * y)) + y) + (((y * y) * y) * 2)) == (x * 6));
    {
        __VERIFIER_assert(6*x - 2*y*y*y - 3*y*y - y == 0);

        if (!(c < k))
            break;

        c = c + 1;
        y = y + 1;
        x = y * y + x;
    }
    __VERIFIER_assert(6*x - 2*y*y*y - 3*y*y - y == 0);
    return 0;
}