extern int __VERIFIER_nondet_int(void);

int foo(int x,int y,int res){
res = 0;
while (x > 0 && y > 0) {
        x = x-1;
        y = y-1;
    }
while (x > 0) {
        y = y+1;
        res = res+1;
        while (x > 0 && y > 0) {
            x = x-1;
            y = y-1;
        }
    }
return 0;
}