0
int a; -- variable definition
"int a" -- string literal
Use integration by parts: int [ln(x)] = xln(x) - int(x/x) = xln(x) - x + c
-1
int n1;
int n2;
int n3;
int n4;
int n5;
int n6;
int n7;
int n8;
int n9;
int n10;
int n11;
int n12;
int n13;
int n14;
int n15;
int n16;
int n17;
int n18;
int n19;
int n20;
int n21;
int n22;
int n23;
int n24;
int n25;
int n26;
int n27;
int n28;
int n29;
int n30;
int(ln(x2)dx)=xln|x2|-2x
int(ln2(x)dx)=x[(ln|x|-2)ln|x|+2]